Thanks to all for your comments.
Jagwire, My experience (4 winters) has been checking the FC level monthly as long as there was no ice on the pool. I have a LoopLoc Cover. Over a month period I was almost always real close to zero Free Chlorine.
Understand --- this is all before I knew any better (this forum).![]()
Looking at my past records I used CalHypo to do a “double shock” (Raise FC to ~ 11 ppm) and circulate 12 hours with a sump pump --- cover up and wait another month. I never had algae doing it this way (maybe just lucky),just lots of calcium dust and other fine debris on the bottom + a few worms and spiders.
This year will be a bit different using the Quat and Bleach rather than a KIT, but I will probably continue with the monthly (or more often) test, circulate and add bleach to maintain a FC level which will be consistent with Ben’s Best Guess Chart.![]()
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