Hello all, I have a Whisperflo with a 2Horse Power motor, all is good until about 2 hours of the pump running, then the pressure drops almost exactly 10psi and then rises again, say the pressure reaches 25psi, after a few hours it drops to 15, then swings up to 25, then drops again. They tell me to check for leaks or possible air getting into the flow.
We took the whole filter apart, brushed and washed everything, looks almost new, started with fresh earth.
Another thing, we can make it swing up and down on the pressure as soon as we turn on the booster pump for the polaris sweep. We also replaced all the hoses for the booster pump.
Anyone has seen this situation? What to do beyond checking for water leaks or air intake?