Minder fiberglass sand filters are constructed by the latest engineering technology. The improvement of flow ability provides an ultra-pure water filtration. The fiberglass winding design allows the filter to have extra strength and resistance to chemical and corrosives. Minder fiberglass sand filters are the most recommendable equipment for the application of swimming pool, aquiculture and industrial water treatment. Multi-port valve (six positions): 1) Filter (normal filtration and vacuuming) 2) Backwash (cleaning filter by reversing the flow) 3) Rinse (use after backwash to flush dirt from valve) 4) Waste (by-passes filter, used for vacuuming to waste or lowering water level) 5) Recirculate (by-passes filter for circulating water to pool) 6) Closed (shuts off all flow to filter or pool)
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