I will be sure to pick a test kit up tomorrow. I will list the levels I just got when we had the water tested Tuesday. Free chlorine is 3.0 ppm,ph was 7.6,alkalinity was 80 ppm, calcium hardness is 325 ppm, stabilizer was 100ppm, and total dissolved solids are 1600 ppm. The pool is 35,000 gal not sure of the brand of filter is a sand filter on a timer. We backwashed it to get it down to 20 psi from almost 40 we use the suncoast gold liquid chlorine as well and the chlorine tablets in the floater. For the algaeside we are using the suncoast stop yellow. Sorry I'm new to all of this and appreciate all the help I can get. Anything else you need to know I will do my best to find out.