My test results today:
CC between .5 and 1
Trichlor stick user (I told them about bleach/liquid chlorine today for the first time)
They backwash 1-3 times a week
18000 gallon vinyl
My neighbor is fighting red and black algea according to both their and my pool builders. Their pool builder says the black algae is under their liner and they need to drain water, pull back the liner and treat. My pool builder says the algea being there is a result of how the pool was built. One or both of the builders said the red algae is now probably all through their plumbing.
We live in Indiana and my neighbor has scheduled my pool builder to close their pool next week. But, since their pool is still consuming chlroine, it seems to me to be a bad idea. Perhaps there is a water temperature at which closing would be OK and the algea would go dormant? With an end-of-year draining now and refill next spring, they will start with a lower CYA and would not need the 50ppm chlorine level to fight the algea. Should alkalinity be adjusted now or can they wait until spring?
The pool store's test results are similar to mine except alkalinity (they show 150) and, although we both agree on the 150 CYA, they say it is OK there.