| 摘要 |
An appts. for purifying a tap water, by slow filtering the tap water from the lower part of the filter tank to the upper part, comprises a water tank in the upside of the water tank, an inflow and water level indicating pipe on the upside of the inflow pipe arrangement, a counter washing valve at the bottom of the inflow pipe arrangement, and a water service main. The water service main is connected to a water tank overflowing pipe, a water conveyance overflow connecting pipe and a counter washing conduit.
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