Opened pool yesterday......brought water in to test everything is "PERFEFCT" except I am showing Nitrates again tester said I am at 10 when last year we were over 25 and we drained and refilled and were fine the rest of the summer.
I put 5lbs of shock in (per pool guys reccomendation) he said if today I showed no chlorine (there is none) we would have to drain again. because the number is lower than last year does it make sense to drain half this time or should I just drain the whole thing??
Please Please HELP!!!!
It's an inground concrete pool 48,000 gallons