OK water clearer now..explain this

[JohnInSoCal]

ok that sounds exactly like what I had and it sounds like mustard algae, just seems strange the stuff would return after only a few hours. My water was never green either but I never had a cloudy issue either, not sure what your issue is there.

I just run the filter 24/7 for about 3-4 days, kept the chlorine at 25 ppm for 2 days, brushed every day, dumped in a bottle of poly 60% to start and then after a few days when the chlorine came back down I put in another quart of poly 60%. My pool is about 20K gallons. I also cleaned the filter (cartridge at the time). You may want to clean out your sand filter and replace the sand as part of this process. I don't have a liner so I don't know what level of FC is safe to prevent bleaching your liner, others will know that here.

good luck