I'm helping my son try to clear up his pool water. He has a 27' above ground and the water is too cloudy to see the pool bottom. We have had it up to shock level FC or above for about a week but little or no improvement in the cloudy water. We use a TF-100 test kit and the CYA is at 40 so we were keeping the FC level at 16 - 22 ppm. When we started the ph was at 7.8 but today it is at 6.7 so tomorrow we will add borax to get the ph back up. Also the TA is at 50 so we will also add baking soda to raise that to about 100. Last night my son did the OCLT and the pool used no overnight FC. We're not sure why we have not been able to clear the cloudy water. Looking for some suggestions.....