What is a water pump?
A water pump is a machine that transports or pressurizes a liquid.
The selection of water pumps to be involved in the factors: power, flow, head, quality and so on.
Power
power in a unit of time, the size of the work done by the machine is called power, in kilowatts.
The root cause of many sick fish in the fish tank is that the power of the fish tank pump is too small and the breeding density is relatively large, the submersible pump of the fish tank filtration system can not decompose the harmful substances in the fish tank in a timely manner, such as ammonia nitrogen, nitrites, etc., and the consequence is that the fish continue to fall ill. Therefore, choosing the right pump is very important for fish lovers.
Choosing a suitable submersible pump depends on whether the power of the pump is suitable. The factors to consider when choosing a pump are: the size of the tank, the form of filtration, the richness of the filter material, breeding density, fish size, fish species, etc.. To put it simply, the larger the capacity of the tank, the less and simpler the filter material, the higher the breeding density, the larger the fish, the faster the metabolism of the fish species, the power of the submersible pump needs to be on the large side to be a suitable choice.
According to the size of the fish tank to configure the appropriate pump. When breeding medium or large-sized fish in a common top-sink filtered tank, a pump of about 25 watts per 100 liters of tank capacity is appropriate.
Flow rate
Flow rate is also known as the amount of water delivered, it refers to the amount of water delivered by the pump in a unit of time, and its unit is liters/second, cubic meters/second, cubic meters/hour.
Aquarium submersible pumpflow with your tank size, water level and the density of the breeding fish have a relationship, the general calculation method for the aquarium submersible pump flow is 6-8 times the volume of your aquarium water body. For example, for example: if your fish tank size of 2m * 0.9m * 0.8m, the water level is 0.7m. then the volume of water in the tank for 1260L, then in general you need the flow rate of the range of 7560-10080L / H. So you can choose a 8000 or two 5000, if your breeding density is not very large, the two 3500 It is also possible.
Lift
The lift is the height of the pump that can lift the water, the unit is meters. That is, the pump can pump water from the outlet to the highest vertical height!
The formula for calculating the head = the height of the filter tank + the height of the main cylinder
Quality
Quality Poor quality water pumps can be a major safety hazard!
There are loud noise, metal parts rust, cracked wires, not working and other kinds of problems, so when choosing a water pump, you must choose some good reputation, good reputation of the brand, you can not simply to save money and buy some poor quality water pumps.
The relationship between the parts of power, flow, head?
According to the relationship between flow and head, pumps can be divided into two categories: flow pumps and head pumps. Axial flow pumps are typical flow pumps, characterized by high flow and small head. Centrifugal pumps (especially multi-stage centrifugal pumps) can lift the water to a very high height, but the flow is relatively small. When the height of water lifting increases, the flow rate of the flow pump will be sharply reduced, while the head pump flow decay is relatively small.
Head, flow and power have a certain relationship, to ensure sufficient head and flow, must provide the appropriate power. Small power pumps, because of the poor ability to lift water, not only its head is small, but also with the increase in height, the flow rate will be sharply reduced, therefore, in the case of lifting a relatively large height of water, the power should be used as an important reference index. The actual flow rate of the water pump is usually not easy to judge, and if you only look at the flow rate indicator provided by the manufacturer, there may be a big difference.
Flow, everyone likes to choose a pump with a high flow rate, so choose the same flow rate of the pump, the smaller the power the more savings. For bottom filtration, the actual flow rate attenuation should not be taken lightly. The flow rate of the pump and the volume of the aquarium has a certain proportional relationship, in general, even if the density of fish farming is very small, the flow rate / hour at least 2-3 times the volume of the aquarium.
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