Recently purchased home with a pool and have had some "smaller" issues that I have a warranty company deal with (might be a mistake). After 1 pump motor change out, the pump lost prime and "melted" the impeller (I didn't see it). They replaced the impeller and noticed that the pressure on the sand filter was high(=30 psi). Wanted to charge me $500 to change out the sand. Needless to say, I first replaced my pressure gauge and it works fine. I then changed out the sand myself. It did have some gray material in it but it was not the source. Since I don't know when the sand was last changed, I changed it myself. Once it was all back together, I still have 30psi on the sand filter and a green pool to boot. I think that the impeller that was put in might be the wrong size and the guy was a con. Any other ideas on the high pressure? I am about to check into the impeller on both pumps to compare them.
thanks for any comments!