I have an older fiberglass pool. I just installed an auto pool filler to the side of the pool to maintain my pool water level due to evaporation. I used to fill by a hose almost daily. I tapped the auto pool fill into my irrigation system to avoid a malfunction which could spree water for hours. Thus, the irrigation system turns on daily for 1/2 hour to allow my pool to fill. Since I have done this, I now have a yellow scale on the side of my pool so I'm thinking it is unfiltered water from my irrigation system (I am guessing my faucet water cycles through my whole house water filter so I didn't have this issue before) I was thinking of installing a water filter to the irrigation line BEFORE the pool fill so water entering my pool would be filtered hopefully requiring less chemicals. Any suggestions on a type of filter? Brands? Other ideas? Thanks