While vacuming loses suction, sand filter pressure goes high
Changed the sand, Pool operates normal. Have good flow, good suction, filter pressure at 24 psi. After 5-10 minutes of vacuming, filter pressure rises to 40 with no suction and no return
Pool & Spa - Hayward - SAND FILTER, PRO SERIES
Answers & Comments
That increase is due to the filter loading up with debris. Is the pool unusually dirty? If there is a lot of dirt and silt in the pool use the "waste" setting on your backwash valve while vacuuming.
This allows the water to bypass the filter and go directly out the waste line. Keep an eye on your water level because you will be removing water from the pool and may have to add more.