Filter pressure gauge showing 40psi when off.

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aberberich

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Oct 25, 2021
7
Dayton, OH
Thread title. The filter pressure gauge on my Hayward sand filter is showing 40 psi when the system is completely off. When on it shows 55 PSI. I assume it’s just a bad gauge that needs replaced since it seems impossible for it to be at 40 PSI when off right? Since I was able to open the pump and clean the basket etc.

Sorry if simple/dumb question. I googled like crazy first but couldn’t seem to find an answer so thought I’d ask the experts!
 
That's correct. I would get a new one. Shoot for one that only goes to 30 PSI - easier to read and you shouldn't go above that. Glycerin filled ones are nice and tend to last longer in my experience.

I would recommend making sure you bring it in with your other pool stuff at the end of the season and not leave it in the filter. :)
 
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