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Phillbo
01-16-2014, 11:35 AM
Hello, my DE filter typically shows about 11 PSI after a back wash. I back wash when it reaches 18PSI..

At this point after a backwash it will read about 11PSI but then spike up to 20PSI within a couple days.

I've pulled the filter apart and cleaned the grids but that did not have any impact on the situation.

Is there other areas I need to look at?

kelemvor
01-16-2014, 02:21 PM
Live algae will clog a filter like nobody's business. Do you have a nonzero combined chlorine reading?