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Subject pool is a 1960's Sylvan inground pool approx. 40,000 gallons. Tapered sides, heavily built. The old Purex 60 sq ft DE filter fitted with bottom backwash valve failed. Multiple pin hole leaks in the tank. I used the next several weeks on deferred maintenance. Pool drained and cleaned...

Thank you for the comments so far. I probably should have titled my post: Water Flow @ 1725 RPM - Is It Sufficient? Data sheet/performance curves for Speck S90 attached. This may better illustrate the reason for my doubts about adequate water flow @ 1725 rpm. In our pool, the pump is...

I am new to the forum - finding it informative with knowledgeable and helpful members. The pool and equipment came with the house. Both are old and basic. Exception is Speck S90 230V 3/4" pump thatI installed 12 years ago to replace a larger pump that wasn't working well. Our pool use and...