Had a couple of dime sized stains when I took over the pool. They disappeared when I got the pool balanced, keeping the pH around 7.5/7.6 July through October. I let the pH rise to 7.8/7.9 through the colder months with no stains.
In the last couple of weeks I've dropped the pH back down to 7.5/7.6 as the temp has risen. In the last week about 30 small stains have appeared, mainly on the shallow end steps.
That doesn't make sense! The only factor I can think of is that as about 6 weeks ago I raised CYA to 50 with 4 pucks dissolving over 3 weeks in a Rainbow feeder half open. FC remained consistent at 7, but pH dropped to 7.2 so I added pH up. Added way too much and had to add MA to bring it back down, all within a couple of hours. Stains have only appeared in the last week, and do appear to fade after MA addition.
Why am I getting these stains at the lower pH? Am I heading for an AA treatment or should I drop pH to 7.2 for a few days and see what happens?
Last nights test results:
Temp 78
FC 7.5 (after small Cl addition)
PH 7.5
TA 80
CH 350
CYA 50
Mike
In the last couple of weeks I've dropped the pH back down to 7.5/7.6 as the temp has risen. In the last week about 30 small stains have appeared, mainly on the shallow end steps.
That doesn't make sense! The only factor I can think of is that as about 6 weeks ago I raised CYA to 50 with 4 pucks dissolving over 3 weeks in a Rainbow feeder half open. FC remained consistent at 7, but pH dropped to 7.2 so I added pH up. Added way too much and had to add MA to bring it back down, all within a couple of hours. Stains have only appeared in the last week, and do appear to fade after MA addition.
Why am I getting these stains at the lower pH? Am I heading for an AA treatment or should I drop pH to 7.2 for a few days and see what happens?
Last nights test results:
Temp 78
FC 7.5 (after small Cl addition)
PH 7.5
TA 80
CH 350
CYA 50
Mike