| 摘要 |
PROBLEM TO BE SOLVED: To select arrangement place in the view point of object and appearance, to improve maintenability, and the space and appearance of the inside and outside of a water tank, to increase filtration capacity and to reduce a cost. SOLUTION: This closed type filtering apparatus for a water tank is constituted so that the arrangement place is selected corresponding to the combination of a filter layer fitting case, a filter layer and an amphibious pump, the number of the filtering apparatuses corresponding to water to be treated are connected, the detachment of the filter layer is facilitated and even if one of a plurality of the filter cases is changed to be cleaned at the maintenance, the filtration functions in another filter layers are stabilized by the connection and in a small water tank or the like using a single filter layer, an inside cartridge is divided to solve the biological filtration problems. Further the miniaturization of the filter as the whole high functional filtration equipment apparatus is attained by using the amphibious pump agreed with the securing of the inside and outside space.
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