Hello. I just opened my pool for the season I did a long backwash, as well as, the rinse. When it's running, there is a lot of noise of sand (or something) bouncing around in the sand filter. Sound like up by the valve unit. What could be the cause? Loose sand ? Need deep cleaning even though I did a backwash?. Seems to be filtering ok. A little tough to tell since the pool was just opened. Never had that noise before. After the backwash, I did see some sand in the sight class. Any suggestions?
Thanks
Rich
Thanks
Rich
