I have a sand filter. my pool is 27,ooo gall. my pool was clear when we first moved into the house in november. the chlorine levels were very high. I let the chlorine drop to about 2 or 3, sometime in april. the water was getting a little cloudy at that point. I added cal. hypo. to the pool for chlorine then it immediately got cloudy and stayed cloudy. this is around april. I kept up my routine of vacuuming, adding soda ash and an algaecide and something called pool perfect and then the cal. hypo. the water never cleared. then I found this forum and stopped adding everything switched to bleach. realized my stabilizer was at 95-100 because I also had the pucks in a feeder. also stopped using those. got my levels up to 25ppm with bleach. it has cleared but cannot see the bottom in the deep end. I am going to hold the chlorine at 25ppm for a couple more days and see what happens. if it does not clear completely then should I add floc? Yes, I did get an algae bloom about a month ago, before I found this forum. My thought was that this white stuff is so fine that the sand does not stop it as the vacuum is picking it up off the floor. and then it is coming right back out through the jets. but what do I know I am really clueless at this point. Maybe something with the filter but I thought I would rule out other causes before going there.