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rapid sand washer purpose of equipment

Mar 12 2009 How to backwash a sand filter The correct backwash rate for a highrate sand filter is the same as it was when the pool filter was in the filter cycle 1525 gpm per square foot of the filter area In rapidrate sand filters the backwash rate must be between 1215 gpm per square foot of filter area which is 45 times greater than the

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