Ok. Went to a pool store. First and last time! CYA level is 20, Free Chlorine 10, PH 7.8 Total Alkalinity is 146, No algae,swamp,slime,ect.. They told me to add .75 lbs of Lo'N Slo. I did not purchase it I had PH down. They did sell me Stabilizer and told me to add 1 lbs. I did not add this yet...