I bought a house with pool and have a question:
My pool sand filter just after backwash shows about 15psi and even running
two weeks without backwashing still stays at about the same level. Is 15psi
not too high for clean sand filter? Other people here talked about 10-12psi.
Also, when I turn off my pump for a night, sometimes filter preassure goes
down to 0, but sometimes it stays at exactly the same level as it was with
pump on - about 15psi. Is that normal?
Thank you very much for your help.
That doesn't sound normal, to me. Have you ever seen it at any reading other
than 0 or 15psi? Have you noticed any difference when you backwash?
It might be best to just replace the gauge, since you say sometimes when
you turn it off the reading doesn't change, and sometimes it goes to 0. My
10-y/o Hayward gauge frequently needed the Flick Test, but other than that
it was pretty accurate so I never saw any real need to replace it.
Another thing you might try is to check that nothing's impeding the return
flow. Do you have any add-ons, like chlorinators? Coudl also try unscrewing
the deflectors from the return outlets, allowing free flow and then see if
you then get a different reading. I've found dead mice in my lines before...
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