just check pool with test strips i know get a kit i have used strips the whole time anyway i still read all ok except stabilizer and to 1st reply i added 4 lb of stablizer 2 days agog and pump been riunning continnuosly since water was full about a week i have a round 21ft x52" pool over last seasons no trouble at all but i changed liner and in so had a complete water change that is why i started all over so what is oto and what can be used to bring up stabilizer also i started this year using a dispenser instead of putting pucks in skimmer ? oh and forgot and most important i also changed sand will be looking for reply thanks lots