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If I let the FC level in my hot tub go to zero for a couple days, the water will become cloudy and become even cloudier very quickly (like a bacterial bloom). No problem - I just keep adding a bit of bleach every couple days and a bit more bleach after every use, and this keeps it in check...

I refilled my hot tub at the beginning of February with 380 gallons of municipal water (San Diego). I gave it a first boost of dichlor to really sanitize everything - about 2.25 tbsp. The next day, my measurements were as follows: FC = 10.0, CC =0.5, pH = 7.6, TA = 120, CH = 190, temp = 98F...

I have a new Hotspring Pulse (380 gal, covered, 24/7 circulation pump, 100F) that was installed end of Sept, so just a couple months old. I put both an ozonator (Freshwater III) and a metal ion stick (Nature 2) in it from the start, hoping that would allow me to minimize chemical additions...