HIGH EFFICIENCY, LOW-PRESSURE FILTRATION UNIT

摘要

A swimming pool water filtration unit includes: a plurality of shallow-bed sand filter modules that receive water from a swimming pool and discharge filtered water simultaneously via a pool water return conduit common to all modules. A valve arrangement associated with the filter modules: (i) selectively but simultaneously switching on and off of all filtered water flow from the trays, which takes place through the return conduit common to all trays, to the pool water return coupling of the tank; and (ii) enable backwash water flow into the individual filter trays in selectable order, preferably through the common return conduit, and opens a conduit for backwash water to pass to waste in a switching state where water flow to the pool water return coupling is blocked.

主权项

1. A pool water filtration unit, having a filter tank dimensioned to receive a charge of filter sand for effecting filtration of pool water in continuous, pump assisted flow through the tank, comprising multiple, shallow-bed sand filter modules located within or defining a an integral part of the tank, wherein the modules are arranged to receive in parallel (as compared to sequentially), in filtration flow mode, water from the pool at low delivery pressure and to discharge filtered water at low pressure from the modules through a pool water return conduit located within the tank and common to all modules.