I have a less than one year old plaster pool and battled high pH from the beginning - as expected with a plaster pool. Last year's start up with potable water was easy. We closed the pool in early December and just opened it last weekend and got the filter running. pH was off the charts. This is my first opening so to get things going, I brushed down the pool and through the pool cleaner in. The cleaner trapped about 2 pounds worth of calcium crystals Ė which makes some sense given the high pH. I started dumping muriactic (31.5%) acid in slowly, 1qt at a time. Iím now a gallon and a half in and pH is still too high and unmeasureable. Without being able to measure, Iím not really sure how long this could go on and looking for some rough advice based on a 20,000 gallon plaster pool? I would think Iíd have to be close to getting it back in range but really have no frame of reference. Last year's start up from potable water only took two quarts to bring it in to 7.2.
Also, trying to get my CYA number in line as well. I have a SWG and targeting about 70. I have the TFT kit and if I use that test it shows Iím at 20. Two local pool stores are showing 40 and my neighbors kit shows 50. Test strips (yea, just for giggles) shows me within the highly accurate 30-50 range, which is convenience since thatís what the other three independent tests show. Nothing like accuracy! Since I donít want to over add, which one do I believe? I ordered some new reagent just in case what I have is bad, but thought Iíd ask.
Numbers.. my chlorine number are low as I just got the salt in but didnít want to start shocking until I got the CYA up a bit and the pH down.
FC = 0
CC = have not measured yet
pH = ??, like a bazillion
TA = 100
CH = 250
CYA = 20
Lastly, is there a way to keep the pH down during the closed months? Thanks for any advice..