My current predicament, albeit I have a floating cover not a solid cover.If y ou get a solid cover, be careful of floaters. They keep adding stabilizer as they assume you regularly top up the pool with fresh water (diluting it). With a cover, you top up less, so the stabilizer starts to build up... to the point that you get chlorine lock, and the chlorine can no longer work. Then you have to drain a significant amount of water and fill to solve the issue.
Pool went green (loadshedding while I was out of country for a week, and because I use a sonoff instead of the rotary timer, if the window is missed it is missed).
But before we try fix it, need to drop down the huge amounts of stabilizer.
Have removed the floater and cover so the sun can help kill the stabilizer, and topping up with the Jojo (good timing on the recent rains in CT)
then had the coof, so haven’t been able to go back to builder’s electronic pool tester, to start the correction phase.
TBF I have had 2 years of trouble free pool maintenance with the floaters and the cover, but I am definitely going to switch to 2 stabilizer-free floats for every 1 regular floater
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