I keep my cya around 40 and I usually add a little bleach every day or at least every other day. I add mine to the skimmer --- slowly. Other people add it in front of a return jet. Either way is ok. Some people say not to put it in the skimmer but the flow of water quickly takes it into the pool so it has never been a problem for me. Poconos also puts his in the skimmer.
Bleach will not fade a liner any faster than any other source of chlorine will. It is actually not as strong a chlorine as some types are. Liquid chlorine sold by a pool store is usually 10-12% sodium hypochlorite and bleach is only 6%. People just associate bleach with fading because in the laundry it will fade or bleach out clothes. So that is what usually gives bleach the 'bad rap' for pool use. Not true.
And, yes, usually a covered pool will not lose chlorine as quickly as a covered pool. But, if you shock, you don't want your cover on because the fumes can damage the cover.
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