I took a water sample to the pool store yesterday because I wanted to check my CYA levels. I haven't mastered the disappearing black dot yet. My pool is 2 years old, full sun, approx 17,000 gals, plaster with a SWCG and haven't had any problems this year. Here are there results.
FC 3.0 PH 7.4 TA 55 CH 445 CYA 25 TDS 4900 92 degrees
I knew my CYA was going to be low after TS Debby dumped a lot of water on us and the pool overflows were running for a couple of days. It took one 40# bag of salt to get the level back up and operational for the SWCG.
My concern came from the high CH level as I thought this would have dropped after all the rainfall. Previously they had reported levels of 375 before the rain. I have a Lamotte test kit and double checked the CH myself and it appears to be closer to 350. So it made me question the other results so I ran my tests and these are the results:
FC 2.5 PH 7.5 TA ? my scale ends at 60 and it was less than that CH 350 CYA ? also less than the scale reads
Should I be concerned about the CH levels? I have checked the SWCG cell and don't see any scale or build up on the plates and the water line tile also looks fine.
Also my chlorine levels have been steady around the 2-3 range and I check adjust my pH at least weekly and add between a pint to a quart of acid once a week. The pool has been almost maintenance free this year other than brushing it and dosing it with acid. I did add a couple of gallons of bleach to it after the big rain figuring it would be best to keep the chlorine level up and not have to wait for the SWCG to do it.
Any concerns with the levels? Thanks