Backpressure decreasing...

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Pool Care Proficient
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Joined: Sat 20 Oct, 2007 18:31

Backpressure decreasing...

Postby sparkwatercleaner » Sun 25 Nov, 2007 20:09

Everytime I backwash my sand filter, backpressure is lower (about 0.15 psi) than the last time I backwashed. Eg, I backwash and the gauge reads 9.30 psi. The following week I backwash and the gauge reads 9.15 psi.
Any clue why this is happenning???

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