ok thanks, I have 27,000 gall fiberglass pool. sand filter. owner just changed sand last year. I am trying right now to shock the pool at 20ppm as per a suggestion from this forum, because of course my stabilizer reading was very high at 95-100. which is why i am convinced to switch to bleach. I have been vacumming everyday to get rid of the white powder . it seems like it is getting less and less. but water is stilll very cloudy. If shocking doesn't work and continous vacuuming both to filter and waste I don't know what to do. my numbers before I started increasing my chlorine were:th-250, tc-3, fc-2, ph-7.2, al-80, stablizer-95-100. new to this and just learning but REALLY appreciate all the advice. thank you, thank you. my chlorine right now is at 15ppm and water is still cloudy not any better so I am going to take it up to 20ppm.