Good morning all. I joined last week. I have decided to make the switch to BBB as past sanitizing has put me in CYA hell.
I have a 25,000 plaster pool in SE Pennsylvania - 3 years old.
My numbers last week: TH 400 - FC 0 - pH 8 - TA 180 - CYA 150
So far I have added bleach to 20ppm. Added Muriatic acid at different times over a few days totaling approx. 1 gallon all together. I brush every day. Have partially drained the pool 2x (to a total of about 1/3 of volume). We have had heavy rains - this helped to refill. Have also been refilling with house tap (200ppm CH). I have backwashed 1x.
Today's #'s: CH 450 - TC 10 - FC 10 - pH 7.2 - TA 140 - CYA 100.
The problem is that I thought I would see the CH and CYA come down much more by now (CH went up???)
.......am I being impatient?
The question I have for your input is:
1. Could the CH and CYA compounds be in the walls(from past) and am I brushing it all loose?
2. Is it a general rule to shock after heavy rains, or does pool chemistry dictate that?
Thanks in advance for your advice.