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Filter pressure went up due to dirt and leaves in my pool after bad weather. My clean filter runs about 20 psi

Thanks for the tips, however none have resolved the problem. One more piece of data: today my back pressure on the filter increased 10 psi after a hard rain. The valve was quiet as i have ever heard. After a long backwash and rinse cycle, the pressure decreased and the noise returned.

The pressure decrease 2 psi in rinse mode. I'm fairly certain it is the valve, but I'm new at sand filters so I'm not 100% certain.

I back flushed for 15 mins and rinsed for 5. Noise did not go away, but I will keep trying. I did confirm from previous homeowner that the sand was replaced 3 months ago

Glad to find the site. Had a bad experience at Leslies today, came home and found you guys. I did take the valve apart and it looked good as new. Verified O-ring was in good shape. Still cavitation noise only on Filter setting.

just bought a home with a 18K pool. Previous experience has only been with SWG pool. In addition to fighting algea, my Hayward multiport valve makes a cavitation noise when on Filter setting. Reducing flow does not work, and I have verified no leaks on pump suction. The noise goes away when...