Ultra white back filter fish tank (can be customized in size)

The back filter is to separate a part of the space in the fish tank to make a filter tank. The filter tank is divided into 2 or 3 small compartments for placing filter materials and water pumps. The first compartment has an overflow port. When the water pump pumps water from the filter When the tank is pumped into the fish tank, the water in the fish tank flows into the first compartment of the filter tank through the overflow port, flows through various filter materials in sequence under the guidance of the partition, returns to the last compartment, and is then pumped back to the fish tank through the water pump to complete the process. Water circulates.

In fact, we can understand the back filter and side filter as a disguised form of sump filtration. The design principles of the three are exactly the same. The back filter and side filter are equivalent to embedding the bottom tank in the bottom tank filter into the inside of the fish tank.