Waterbear is right, the filter she made was to catch the brown sediment that was going into the pool. The only other thing I can think of is to add a little calcium to the water. One time my water was tinted green and when I added calcium it turned blue - I still can't figure it out, but I saw it with my own eyes Maybe someone can tell me why this happened. I was shocked, but I added it to my "things that night work" list