Patent ID: 8475657

Claim:
A method for filtering liquid in an aquarium, characterized in that, and comprising the following steps: A. Use a liquid filtration device, set water inlet around a casing of the filtration device and set grid panels inside both sides of the casing, after the liquid to be filtered flows through the water inlet into the filtration device, the clean liquid filtered flows out from the grid panels; the casing of the filtration device includes two enclosures with symmetrically set grid panels, wherein the two enclosures are integrated as a whole by means of ultrasonic welding or adhesive; B. An inner filtration body and outer filtration body are set respectively inside and outside the grid panels of the filtration device, between the inner filtration body and grid panels sets filtration materials; The Step B further comprises the following steps, B1. Two outer filtrations bodies are respectively fixed outside the grid panels of their own by means of adhesive of heating sticking; B2. Two filtration body hold-down with grids are set by taking the central plane parallel to the grid panels as a symmetrical plane in the filtration device; B3. The two filtration body hold-down are fixed respectively inside the casing together with the inner filtration bodies of their own, thus forming first buffer space between the opposite sides of the two filtration body hold-down, second buffer space between the surrounding of the two filtration body hold-down and the inner wall of the enclosure, and two third buffer spaces between the corresponding inner filtration bodies and the grid panels; B4. The filtration materials are filled in the two third buffer spaces respectively.