I failed to mention in my previous reply that we have again been using only bleach with Chlorine over 15 ppm for the last two weeks (min 14 days while brushing daily). You can probably go back through my wife's thread to see how that transpired, but for the last couple of days the free chlorine wasn't dropping overnight. As I mentioned we are now out of test solution so we have purchased more. Chlorine should still be over 15 ppm as I added 3 gallons of bleach last night after we ran out of test solution. Tonight is the first time I've added floc.