BACKWASH HOLDING BASIN MIXING Case Study Visit our Website at www.phiwater.com, email info@phiwater.com, call us at (800) 641-1726, or write us at 15 Oro Beach Dr., Oroville, WA 98844. FOR INFORMATION: The key to effective drinking water filtration is regular backwashing of the filters, and as long as mud remains in thin suspension in a backwash holding basin, it can be pumped out. The City of Houston East WPP found itself with

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