Natural equilibrium filtration apparatus and method with slow-down cleaning …

JP2012045459A5 · office JP · priority · published 2012-05-24

In order to solve the above problems, in the present invention, a filtration pond having a filter medium layer and a drain trough disposed above the filter medium layer, a communication path provided below the filter medium layer of the filter pond, and the communication A filtered water tank …

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Open the patent document · source query “water filtration”