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These 9 Above-Ground Pool Filters Will Keep Algae and Debris out of Your Pool All Summer

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JSTOR Daily

Two-stage backwash system for wastewater filters using primary and final effluent

Research Journal of the Water Pollution Control Federation, Vol. 61, No. 11/12 (November/December 1989), pp. 1651-1657 (7 pages) The two-stage backwash system (TSBS) has been developed for water ...