Sand Filter...clean psi doesn’t seem right.

[Neemer]

Is this an issue? I just backwashed and my clean filter psi is 18 psi. It was was indicating 18 psi before I backwashed.

Due to a late season pool build last fall and a fairly late opening this year, my filter has been in service for maybe a month. When it was first installed, PB showed me that clean psi was 14 psi. I backwashed last week on the day I opened it, and clean psi again was 14. Today it won’t drop below 18 psi.

What’s going on? Anything? The guage is a new glycerin filled jobber I just bought from TSTestkits so I should be good there.

 

[sktn77a]

How long did you backwash?

 

[Neemer]

I backwashed until the water in the glass was clear. Same with the rinse.

 

[Richard320]

The sand could be clumping up and have a hard crust. Deep Cleaning a Sand Filter

 

[proavia]

Are you comparing readings on the old gauge to your new glycerin filled gauge? If so, the 2 gauges may not indicate the same - most likely the old gauge is off by a few psi.