2nd year of owning an IG pool. First time opening it. I am getting a whooshing sound around the multiport valve and Its driving me nuts that I don't know what the issue is. I changed the sand in the filter and backwashed and rinsed before opening the pool. No leaks on the suction side, the pump lid shows zero bubbles. Only hear the noise while on filter. It goes away when I change to any other setting including recirculation so it makes me believe its something to do with the tank/sand/laterals/. PSI holds steady around 11 and over night it increases to 15 as I am in the process of slamming. backwash and rinse and its back to 10-11. The return jets blow strong altho i notice a very small amount of sand blowing into the pool.. The spider gasket looks okay. I do not notice any debris thats moving around on top of the sand i the tank either.
