My sand filter is flowing weak lately. So, I decided to give it a clean. When I opened the top part of the sand container, I had found that whole bunch of dirty stuff inside the lid. I cleaned it. Then I saw the water inside the tank is so dirty, like dark brown. There is about half of inch of drossy/sediment on top of the sand. I pick it out as much as I could. Closed the tank top, wasted it but the water came out clear. So, I turned on the filter. At the inlet, I saw dark brown water flowing back to the pool. I used the hose to catch (what I could) that and ran it out side. Can't believe how much dirty the water is. After that, the water was clean.
Why the filter throwing dirty water back to the pool?
I guess the dirty water is supposed to come out when I used wasted function. For some reason, it didn't work. As a result, the dirty stayed in the tank and blow back to the pool????