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All - first thank you so much for existing. I've been lurking here for 5 years and this has been my go-to for, well, everything. So, we had a minor emergency last week where my automatic valve didn't stop where it needed to (pump was on....) and we had to replace the (16 year old) filter...

Background 1st and most importantly, thanks to everyone that is on here - I've learned so much from this forum. I've been doing TFP for 3 years and it has been, well, trouble free. 2nd....Although I've been doing the chemical balance thing for so long, today was the first day I tried to...

I was wondering if anyone knows - all things being equal - how much acid (31.45%) you should have to add with bleach (8.25%) to keep the pH constant? (important note: I don't mean to mix the two together as I prefer not to die from fumes or whatever) I just want to know how much I should be...

So I do my routine tests as a part of a SLAM but leave all the chemicals in the vial (lazy...and I was up at an ungodly hour to test). Anyway, overnight test has FC 15 and 0 cc but left it there and this morning (ok, was morning before too - but now everyone else awake) and the chemicals/water...

Can someone please explain the chemistry behind FC and CC? (or just tell me where I am wrong here in the below assumptions). If you start with a TC of 10, where FC = 6, and CC = 4. Then you add 1 ppm bleach then (assuming pitch black/no sunlight effect and no time, yet, to work on killing...