Went out this morning to a skimmer full of leaves and two algae stains, one on the steps another in the middle of the pool at the bottom. tested chlorine, prior to the pump and swg starting this morning and FC was 3, cc:1. I have been keeping my fc around 7 since the weather turned cold (well, cold for florida, water temp 70). A few weeks ago I decided to lower my fc so I shut off the swg for a day. I turned swg back on at a low percentage to keep fc at 4. It seems like everytime I decide to drop my fc below 6, I get some type of algae problem...this is only the 3rd slam since the pool was built last April. Well we got a spell of hot weather the last 3 days and some wind yesterday which blew a ton of dead leaves in the pool. So I did the trek to cvs and got the 8.25% bleach in, enough to bring up FC to about 28 ( I tend to overshoot on the slam by a couple ppm) at 11:30am. Well after a good brushing, the stains were gone about an hour after I added the initial amount of bleach. I also had the swg on 100%. Only have added 120oz of the 8.25% since the start of the slam. Just tested my Fc and I am at 34. So I just turned off my swg.
Ok, there's the background... I guess my question is, why do I keep getting algae problems when I bring my fc to 4? I've read over pool school and do pool math consistently and 4 seems like it should be ok? Also is it normal for algae stains to go away so quick?
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CH:825... Yes quadruple dope checked... Fill water is high.