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So part-way through a SLAM and got a higher FC reading than I would have expected according to PoolMath and the amount of bleach I put in. I am using TF-100 for testing. One possibility I was thinking is that maybe my pool size is off, although 35,000 should be close. Reason I know is we got...

Last fall, when I closed down the pool myself, I got some 1.5 inch (that sounds about right) plugs from Home Depot and screwed them in with teflon tape after pouring some RV antifreeze down there to prevent freezing. Now, I am having a really tough time getting the plugs unscrewed - my tongue...