How to properly install the pump in the aquarium
Instruction The simplest pump consists of a glass with a filter sponge, a motor and water pipes. Let’s figure out how to install the device in an aquarium: The purchased pump should be assembled according to the instructions. Many modern models have two types of fastening: vertical and horizontal (suction cups); when installed on suction cups, the vertical fasteners must be removed. Next, choose a suitable place on the wall of the aquarium, preferably in the corner, press the suction cups against the glass. If attaching to a vertical bracket, secure it to the edge of the tank. To improve cleaning and aeration, it is better to direct the water flow along the wall of the aquarium. If there is a need for two devices, their flows must be directed in different directions. You need to install the pump when all the decor items and soil are already placed in the container. Important! The submersible version of the device should not be located above water and work “dry”. Also, do not check the operation of the internal filter in an empty aquarium.
What is a pump for??
Its main task is to ensure the normal functioning of the aquarium: pumping and mixing water, supplying oxygen. It is he who creates the pressure required for the operation of the external filter. If necessary, it helps the formation of a stream in the water, promotes the operation of the aerator, slows down the process of contamination of the tank.
There are several varieties of this device:
- internal type;
- external (or external);
- universal model.
Homemade aquarium pump: pros and cons
The main advantages of a home-made device: saving money; if you know how to work with your hands, assembling the pump from improvised means will not take much time; the device can be modified according to your wishes and the needs of the inhabitants of the aquarium; If desired, the device can be given an aesthetic appearance that matches the decor of the container. Possible errors in work can be considered a downside, for example, insufficiently strong sealant or inaccuracy in calculations.
Features of the choice and use of pumps for a marine aquarium
Saltwater aquariums usually contain corals and various types of sponges as natural water purifiers. Both those and others, as well as fish in their natural habitat, are dependent on the current. All life cycles, the availability of food, the change of seasons for marine inhabitants are associated with the current. Taking into account this important factor, current pumps are installed on the reservoirs with the inhabitants of sea waters, which also perform the function of purification and aeration. You need to take into account the following nuances: For ten to twelve hours, the pump must be turned off, imitating calmness. The volume of pumped water per hour should be about fifteen times the volume of the tank. The stream of water is directed to the bottom stones. For large containers it is recommended to purchase two devices.
It is not difficult and not long to assemble a device for your silent pets on your own, especially for those who are at least a little familiar with the operation of such devices. In the absence of skills, you can look for a budget option, but in any case, this device is vital for aquatic inhabitants.
How to install your aquarium pump correctly?
An aquarium pump is a very important device. Its task is to form a flow and saturate the water with oxygen. Sometimes aquarists use it to fill the aquarium with water. If such a device works together with a pump with a special foam sponge, then it will be able to function as an internal filter for mechanical cleaning of the reservoir.
Basic selection rules
When choosing a pump, you should take into account the power of the device and the volume of the aquarium. you can see a good selection of pumps for the aquarium here. To service a small one, a low-power model is enough. Especially if it will only be used to supply water. For a container with a volume of more than 250 liters, a more powerful version will be needed.
It is also necessary to take into account the height of the water rise (this indicator depends on the volume of the tank). The larger the capacity, the more powerful the pump is needed. The one that pumps from 3 to 5 volumes per hour is considered effective.
Another important consideration when buying a pump is the type of aquarium (saltwater or freshwater). For each variety, you need to choose the appropriate model
Operation and care
During operation, external filters do not cause any trouble to their owners. The aquarist should only remember that it is strictly forbidden to turn off the equipment at night. If, for any reason, the electricity in the house was turned off for 12 hours or more, then the nitrifying bacteria on the substrate will die, and the aquarium will need to be restarted. Such equipment should work around the clock, which will ensure high-quality purification of aquarium water.
The outdoor filter is easy to care for. Once a month, you should open the case and rinse the sponges from existing dirt. This work is done as quickly as possible and takes 5-10 minutes.
After rinsing the sponges, it will also be necessary to pump the system from air, for which a hand pump is used, which expels unnecessary air from the tubes.
A major flush of the system is performed approximately once a year. For such work, 10-15 liters of water should be drained from the aquarium in a small bowl. The filter is disconnected from the power supply, disassembled, all fillers are washed in a basin of water, after which the cleaning equipment is assembled in the reverse order. Such work is usually not difficult and takes at most 20-30 minutes.
Installing an internal or external aquarium filter is fairly straightforward. You just need to decide on the location, be careful when assembling, connect the device to the network only after complete installation of the equipment. Subsequently, it will be necessary to properly maintain the equipment, regularly flushing it, and avoiding prolonged power outages, which subsequently leads to the need to restart the filter and the entire aquarium.
In real bodies of water, oxygen enters through the flow of wind and fluctuations in the water. In a closed container, aquarium pumps are responsible for this process.
How to Choose The Right Filter For Your Aquarium!
- By design. There are piston and diaphragm options.
- By installation. There are submersible and external.
Piston devices will last a long time, and they are more powerful than membrane ones. Their disadvantage is that they make a lot of noise and vibrate. Such devices should be used for aquariums with a volume of more than 200 liters. Diaphragm pumps run quietly and consume minimal energy. They have one drawback. they are suitable for containers up to 150 liters.
Equipment that is submerged under water is attached with clamps or suction cups. The external model is installed behind the aquarium. It is designed for small containers and also suitable for the rearing of demanding fish. The pump for the aquarium can be easily fixed with your own hands.
What models are popular
All aquarium pumps differ in power and performance. There are universal devices that are suitable for fresh and salt water. They can be located both under water and outside the tank.
- Eheim. Suitable for full immersion in water. The power can be easily changed using a special regulator. It is possible to make an artificial waterfall, as well as increase circulation.
- Home aquarium lifting pump is used for sea and fresh water. If desired, a timer can be set to stop operation for 10 minutes. Equipped with a controller that allows you to change the flow rate and power.
- The model is made in Poland, and it is equipped with an energy-saving motor, has a flow regulator, so it can be used as a circulation pump.
- Submersible device, which is characterized by small dimensions. Used to create the movement of water, and also saturates it with oxygen.
- Resun. This model is often purchased by people who keep small aquariums at home. It is inexpensive, because it has a low power. about 200 l / h.
- Tunze. It consumes a minimum amount of energy, operates quietly and is compact. Some models are equipped with special protective grilles.
The pump in the aquarium should be quiet, especially if it is located in the bedroom. When choosing a model, you need to focus on its characteristics so as not to make a mistake when buying.
Some installation features
Installing an aquarium pump is a snap. You can do it yourself. The device is usually attached to the walls with special suction cups or with a bracket. In a tank, it is more practical to place a submersible pump in a corner, directing the water flow along a large wall. This will speed up the flow and improve cleaning. When installing two pumps, it is necessary to separate their water flows in different directions. What is it for? So that they do not interfere with each other to create a continuous flow.
Do not allow the aquarium submersible pump to run in air, as this can lead to overheating of the engine and its failure. If you have to choose where to install your external pump, remember to keep it away from electrical outlets and appliances. This will avoid problems in the event of leaks.
All external and internal pumps have plastic casings. The only difference is that the motor for freshwater aquariums has a metal axis, while for pumps operating with salt water, the motors are made with a ceramic axis.
Aquarium pump: types and everything you need to know about it
There are much more living organisms and plants in an aquarium than in the same volume of water in a natural reservoir. This is one of the reasons for the rapid pollution of water. It is easier for a larger volume of water to cope with an imbalance in biological balance. A pump for an aquarium helps to partially solve this problem of small home ponds. Without it, most aquarium fish will swim on their backs, because this device performs the functions of purifying the aquatic environment.
type of instalation
Depending on the conditions of use, aquarium pumps are submersible and external. By the name of the first, it is easy to guess that they are under water, such pumps are more often used. The external pump is fixed on the wall of the tank from the outside.
Due to the continuous operation of the pump, energy consumption increases, so it is wiser to opt for a model with a low power. But at the same time, it must be sufficient to maintain comfortable conditions for fish and vegetation in the aquatic environment.
For an aquarium, you need a pump with a capacity of 3-5 times the volume. For small containers, the best option would be a mini-filter with a capacity of up to 400 l / h. This indicator is indicated in the passport of the device, among its other technical characteristics.
Design features and principle of operation of the pump
The electrically driven centrifugal pump immersed in aquarium water has a simple design. It consists of an engine and a filter compartment. The stator and rotor with the impeller are coaxially located in the sealed motor housing. The filter compartment has a cylindrical shape, with perforations. A multilayer filter is put on it, thanks to which the water sucked in by the pump is purified from various particles and suspensions.
The aquarium filter is made of multi-layer sponge. When the engine is turned on, the rotor with the impeller begins to take aquarium water, driving it through a sponge filter, and then pushes the already purified water back through the outlet pipe. Many models have an aerator that oxygenates the water.
Watch the video about aquarium pumps.
Some aquarium pump manufacturers place a filter sponge filter in a plastic container to make the device look aesthetically pleasing. To knowledgeable aquarists, the idea of improving the appearance of the pump seems useless and even harmful. Reducing the volume of the foam filter makes water treatment less effective. After all, the spongy surface is a haven for colonies, nitrifying bacteria, thanks to which biological purification of the aquatic environment is carried out.
Most aquarists prefer to DIY aquarium equipment. The Internet allows you to find many ideas for making homemade aquarium pumps. For those who want to save a family budget, a self-assembled pump is the best option for a home aquarium, why buy imported equipment that is too expensive.
This criterion is especially important when the aquarium is in the bedroom. The pump noise level is indicated in the instrument’s passport. Outdoor pumps have a higher noise level. It is worth paying attention to the models of famous brands, since they are less noisy.
What is a pump for?
The world of the aquarium hobby is vast and diverse, so newcomers to the field are often at a loss to hear how much it takes to set up a home aquarium. For example, many novice aquarists do not know what an aquarium pump, or a water pump is. and yet, this is one of the most useful designs.
It is no secret for experienced divers that oxygen supply to the reservoir is necessary for fish breeding at home. If there is no aeration, or it is organized incorrectly, then this negatively affects the well-being and health of small pets. they get sick and die. It also leads to turbidity in the aquatic environment, the formation of an unpleasant odor and silting of the soil. To avoid such incidents, aquarists use a pump. this is what a pump is for.
Water pumps carry out the following main functions in tanks:
- Contributes to the purity of the aquatic environment.
- Provide saturation of the liquid with oxygen and movement of flows, which contributes to the elimination of the film on the surface and equalizes the temperature regime.
- Decorate the appearance of the tank. air bubbles rising to the surface give the aquarium a catchy and mesmerizing look.
- Increase the flow of the soil, which prevents decay of the substrate.
The role of pumps in the world of aquarium hobby is enormous, because only with this device it is possible to organize the supply of oxygen to the aquarium at night. During the day, this is not so important, since plants emit oxygen, but at night, an excess of carbon dioxide is formed in water bodies. Installing a pump in an aquarium can solve this problem. In addition, if there is a foam sponge in the structure of the device, then the structure can also replace the filter.
- Overpopulation of the reservoir.
- Aquarium model narrow and deep.
- There are no live plants in the container.
- Water biofiltration is impaired.
- The aquarium is equipped with a tight-fitting protective cover.
The external pump in the aquarium is installed from the outside, while the models of the internal types are immersed directly in the water. The good thing about universal designs is that they can be fixed on both sides of the tank without any problems.
In addition, water pumps can be divided into two more types:
- For a pond with ordinary water.
- For a salty liquid aquarium.
The difference is that the freshwater models have a metal axle. Such models are not used in a container with salt water, since the axle will quickly become covered with rust, therefore, ceramics are used for sea reservoirs.
Aquarium pump and everything you need to know about it
Creating an extraordinary and well-functioning aquarium with colorful fish and lush plants is no easy task. Most often, the difficulty for novice aquarists arises when choosing equipment: in addition to lighting and filtration devices, you will need a pump for an aquarium. one of the most necessary devices in aquaristics. Thanks to the operation of this device, the water is saturated with oxygen, and the proper conditions for the life of flora and fauna are created. In order for the device to serve for a long time and work efficiently, you should know how to choose a pump for an aquarium.
Aquarium type and location
When choosing a water pump, one should also take into account the type of reservoir: for fresh water tanks, structures with metal elements are purchased, for marine ones. with ceramics. In addition, you need to take into account the location of the tank, since some pumps make a loud noise during operation, which causes discomfort for those people whose aquarium flaunts in the bedroom or recreation area.
How to choose the right one?
- Eheim. devices belong to the universal group according to the method of installation. Perfect for all types of aquariums. Also, these pumps can adjust the power.
- Resun are affordable models for small and medium-sized tanks. The smallest productivity. 200 l / h.
- Hailea. devices of this brand are equipped with suction cups and a power regulator, are available for containers of different sizes.
- Aquael. the smallest capacity of these devices is 350 l / h, suitable for small and medium containers.
- Aquarium system. quality appliances equipped with overheating protection and flow power regulator.
- Tunze are proven and reliable pumps with different capacities. Good because they do not make noise during operation.
The power of the device is selected based on the volume of the artificial reservoir. In small containers, pumps with a capacity of up to 380 l / h are used, in an average capacity. up to 600 l / h. If a giant tank of more than 500 liters is installed at home, then a device with a capacity of 5000-8000 l / h will be required. In order not to miscalculate, you can use special tables for calculating pump power.
Purpose of application
When choosing a pump, you first need to decide for what purpose the structure is being bought:
- Filtration will require the introduction of a sponge, if it is not provided by the manufacturer.
- Aeration requires a hose located above the surface of the liquid.
- To create water flows, a flow pump is needed, which mixes the water layers.
- If the pump is purchased to fill a reservoir, the liquid rise level and the drain hose must be considered.
An external pump has a higher noise level than a submersible pump. Inexpensive models often make a lot of noise, creating discomfort, especially in the bedroom. To reduce noise, you can install additional equipment. a system of smooth regulation of pump performance.
Modern models are equipped with special vibration damping devices or additionally purchased magnetic holders. In models of leading companies with a low noise level, power regulation is provided.
Varieties of compressors
There are two types of aquarium compressors: piston and diaphragm.
Piston type. the medium is fed into the cavity of the nozzle for spraying using a piston.
Membrane. supply oxygen to the atomizing element using a membrane.
How to make a diaphragm pump for an aquarium with your own hands
A low-power air supply device is useless in a large water tank, too powerful. it will create a strong current that will interfere with fish and plants and increase power consumption.
Reciprocating compressors are durable and have a wide power range. Reciprocating compressors are used in aquariums up to 100 liters. The disadvantage of these compressors is their relatively high cost compared to membrane compressors, as well as a high noise level.
As previously stated, compressors are devices for oxygenating water in a container or tank. The bubble lift that the compressor creates is a decorative element of the aquarium and provides the maximum area for oxygen to diffuse into the water. Due to the operation of the compressor, the medium in the aquarium is stirred.
Design features and principle of operation of the filter pump
The pump is designed for cleaning, mixing and oxygenation of containers with a volume of more than 50 liters.
The pump is a submersible centrifugal pump. It consists of two main parts: a pump and a filter unit. Filter. a cylindrical body with holes, which is surrounded by a multi-layer material that filters the medium in the aquarium.
The filter material consists of several layers and has a spongy structure. When the pump is turned on, the movement of the liquid begins, pushed by the rotor and directed through the pump due to centrifugal forces. The filter block is installed on the device to exclude the ingress of foreign objects into the working part of the pump and to minimize contamination of the reservoir. Depending on the model, the pump may have an additional aerator to saturate the water with oxygen molecules.
What are the criteria for choosing a pump for an aquarium
The use of a particular type of pump in aquariums depends on the characteristics of the container (volume), as well as on the type of fish and other aquatic life. The main criteria for choosing a pump for an aquarium: type of installation, throughput, material, pump-filter power, installation location, noise.
Pump or compressor.
A pump is a compressor and a filter rolled into one. With its help, you will not have to think about the purity of the water in the aquarium, and about the problems associated with pouring food into the aquarium. In general, the pump is ideal for aquariums with a volume of fifty to two hundred liters. The main thing is to remove and wash the filter sponges in time. And remember to turn it off before feeding the fish and turn it on after about an hour. Otherwise, it will quickly clog up, and your fish will remain hungry.
Your fish are living things, so they need care and attention.
How to choose a compressor for an aquarium?
How to choose a net for an aquarium
Aquarium thermometer. Making a choice.
The main positive quality of the pump is that it can work silently. The compressor cannot work silently, even if it is taken to the balcony, there will be noise from the sprayer. In addition, pumps create a flow, but this is not always necessary. Bubbles from the nebulizer also create a current, but it is usually weak and directed upward. A sponge is usually put on the pump inlet. a filter is obtained. You can also put a sponge on the sprayer and you will get a filter, but the filter will be weaker than a sponge with a pump, and the aeration efficiency will drop.
There are several ways to oxygenate water using pumps.
Mixing. oxygen itself enters the water in the upper layer of the aquarium, but without mixing the water in the aquarium, oxygen deficiency may occur at the bottom, then the fish float to the surface and swim at an angle to it in order to breathe the most oxygenated water. If you put the pump so that it takes water from the bottom and delivers it up, the rate of saturation of water with oxygen will increase several times or tens of times (depending on the flow). In this case, the pump will work absolutely silently, but the current will carry the slow fish to the far corner, and the plants will all be tilted to one side. In a similar way, the water is saturated with oxygen in streams on a current, and in ponds without a stream, fish can have a hard time.
The compressor also saturates the water by mixing layers of water and diffusion from bubbles, but the pumps are silent, and the flow can be created much stronger than from the compressor.
Mixing with air bubbles. in this case, an air tube is supplied to the pump outlet and the pump draws in air from the atmosphere with a current. The stronger the current, the more air will be sucked in. The advantages are the same as in the previous method, only aeration is enhanced due to the large number of bubbles and a little noise appears. In my experience, a bubble pump is quieter than a compressor with a similar performance.
Sprinkling. a platyk tube with holes, the so-called flute, is put on the pump outlet. The streams of water from the holes of the flute take oxygen from the atmosphere, and when they hit the water, they create additional excitement and heaps of bubbles. The method is noisier than simply sucking air from the atmosphere, but when sprinkling there is no powerful current flow in one direction, so fish and plants are not blown away. You can get rid of the noise by directing rain onto the wall of the aquarium, or by drowning the flute below the water level and directing the trickles upward to create small fountains. The result is an absolutely noiseless method of aeration, without blowing flow and more efficient than the first method.
Usually, owners of aquariums with compressors turn them on specifically so that there are bubbles in the aquarium as an element of decor. If the bubbles are tired or interfere with sleep, then you can safely buy a pump with a flute and preferably a sponge. If you like the bubbles, then there is no point in changing the compressor to a pump.
I have both a pump and a compressor. The pump runs around the clock, and the compressor turns off at night.
Hello. I have a Hydor Ario 2 ColorMix compressor. Cool thing, there are three backlights (blue, red and green) that alternately light up. The bubbles are colored the same. The air supply is regulated by a special switch, the bubbles turn out to be small-beauty! Works almost silently!
I personally use a compressor and a pump.
The backlight in the pump, and even flashing in different colors. look at the flashing light for a couple of hours. Like well-being. like the fish, SHOCKED.
Is “rain” below water level? What for? Where is the saturation?
When raising fish, it is better to use a compressor, noisy YES. But the eggs and larvae are intact, and they are sucked into the pump.It is very convenient to use the compressor when removing the eggs taken from the parents, a weak flow of bubbles directed to the eggs will be analogous to fanning the eggs with fins.
Everything has its place!
I am using a pump and the compressor is gathering dust as unnecessary. The pump creates a flow, which is favorable for mixing the layers of water, therefore, their uniform saturation with oxygen and equalization of temperature. The flow is also beneficial for fish, especially for those species that need it. If the pump is of high quality, then the noise from its operation is not audible at all.
I like the pump more. Looks very nice (I have backlit). And when I put the compressor on, my fish started to die, so I had to change to a pump.
Hello. I bought an aquarium not long ago. Somewhere 40 liters. I have 12 fish there, different. Not long ago, 13 little ones grew up and I transplanted them into a common aquarium. I bought a pump. Say the tube should be inside the aquarium or outside. If I turn on a lot of bubbles outside and the noise is worth it. I was advised to put a pipe inside the water. What to do. thanks in advance
Hello. There is a pump of this kind. Inside, if you disassemble there is a magnetic disc to which the blades are attached. This structure is impaled on a stick-rod. As I understand it, when electricity is supplied, magnetic waves are created, the mechanism works. (This is so in my non-technical imagination). The next question is that this stick the rod rests on two points: the upper one in the mechanism and the lower one on the lid to which the filter is attached. So, so that this stick does not dangle, it is set on rubber tips. Tiny. So one of them was lost. What can be replaced? Can they be sold? without such a tip, the pump hums very strongly. it is impossible to sleep. Thanks for the advice
rubber inserts are taken from a non-working donor pump.
2 the axis is clamped into the drill chuck, a piece of rubber (for example, an eraser) is pushed onto it and, when the drill is turned on, grind it with sandpaper to the shape and size of the insert.
Good day. What kind of air suction pump would you recommend? Aquarium 300 l.
Aquarists’ secrets. Part 13
Aquarists’ secrets. Part 4
Question 4 “Are there quiet filters?
Not. Any filter performs filtering, therefore, noise and vibration will still come from it. There are manufacturers that indicate the noise level or mark “minimum noise”, but there are no silent filters.
Question 5 “Where is the correct position of the heater in the aquarium?
Aquarists’ secrets. Part 6
Question 6 “How to properly set up the heater in the aquarium?
At the beginning, place the heater, for example, in a bucket of water, put a thermometer in the same place.
Duplicate at what peak temperature the heater turned off the water heating.
Compare the difference between the scale of the heater and the thermometer.
Remember this difference. When setting the temperature in the aquarium with a heater, always correct for the difference calculated above.
Question number 27 “What is important to know when buying a thermometer?
Question 9 “What is a check valve?
A small device that does not allow water to drain from the aquarium in the event of a compressor stop.
Design features, principle of operation
There are several characteristic features that different models have and which are taken into account when choosing.
- Power regulation. Some pumps have only one constant mode, but it is more convenient if the flow rate can be adjusted at your own discretion.
- Full immersion in water. Usually, universal pumps have this option. They are made of materials that can easily withstand the effects of water, do not deteriorate, do not become unusable.
- Mounting method. The suction cup is considered the most versatile and simplest option. But it is important to make sure that it is of high quality and that it holds the pump on the wall of the aquarium, not allowing it to slip.
- Intake grate. A very useful structural element that increases its safety. Acts as a protector for fish and other inhabitants of the aquarium so that the pump does not harm them, so that the plants are not sucked into the filter.
Powerful pumps for large aquatic aquariums can additionally have aesthetic functions. For example, pumps work in several directions and draw a pattern inside the water using air bubbles.
Why do you need a pump
Thanks to the operation of the pump, the well-being of aquatic life, including plants, is maintained, and the water remains clean. The pump will create an aesthetic effect with air bubbles. Together with the filter, it stably cleans water from impurities and impurities.
Among other technical devices, the aquarium pump plays a key role. Aquarists select these pumps with additional functions to solve various problems:
The BEST Aquarium Filter for BEGINNERS?
- provide conditions for the life of microfauna and plants;
- stir the water and prevent it from stagnating;
- create a flow and make water flowing;
- blow air into the water.
Less commonly, a pump is used to pump water.
Sponges made of foam rubber and similar materials can additionally be used with the pump. in this case, the pump also turns into a filter, due to which mechanical impurities are reduced. Thanks to the filter, the water is kept clean, no matter how actively the inhabitants are.
Models of the following manufacturers are often found:
Pumps with a universal arrangement. Attached to suction cups, positioned for salt and fresh water. Adjustable power.
Inexpensive pumps for small to medium sized aquariums are more commonly available on the market. Minimum capacity 200 l / h.
Aquarium pumps are equipped with a suction cup and power adjustment. Models for tanks of different sizes.
Devices with a minimum capacity of 350 l / h. For medium and small containers.
- Aquarium system
Reliable devices with overheating protection, well proven. There is an adjustment of the strength of the flow of water and a range of powers.
Universal pumps with different capacities. Compact and quiet.
Due to the continuous operation of the pump, energy consumption increases, so it is wiser to opt for a model with a low power. But at the same time, it must be sufficient to maintain comfortable conditions for fish and vegetation in the aquatic environment.
Indoor apparatus is attached to a surface with full immersion in water. This is a mandatory measure for the correct operation of the device. If there are two pumps, the flows are set in different directions for continuous flow. It is better to place external pumps away from outlets and electrical appliances in order to prevent short circuits in the event of a leak.
What is the best filter or pump for an aquarium?
Fish and other aquarium inhabitants, together with plants, is not only beauty and variety. This is also the reason why the biological balance in a closed water volume can be disturbed. So that the water does not get polluted and does not stagnate, so that there is always enough oxygen in it. it is worth buying a pump for the aquarium.
Apparatuses with metal components are suitable for freshwater tanks, and ceramic ones for salt water. There are also universal devices.