Ascorbic acid treatment for stains, which sequestering agent to use?

[PoolDoc]

Are y'all not swimming now? I just looked at your weather forecast, and it's showing lows in the 70's and highs in the 90's for the next week.

As far as 'out of service' -- I would only anticipate it being out of service for a couple of days while you were treating it with the ascorbic acid. None of the other things would be incompatible with swimming.

Let me contact Chem_Geek and Marie, and also, I need to get the chemical info page posted, so I can direct you to the exact products you need.

High evaporation + high calcium fill will absolutely tend to cause a climbing calcium level. I'm posting your test results from your earlier thread here, for reference in this thread:

Fill water:
FC = 1.2 ppm
CC = .2 ppm
pH = 7.6
TA = 140 ppm
CH = 270 ppm

Pool water:
FC = 4.2 ppm
CC = .2 ppm
pH = 7.8 (acid demand test yielded 1 drop to bring to 7.6)
TA = 180 ppm
CH = 600 ppm (tested this 4 times, once at 25ml and 3 times at 10ml)
CYA = 90 ppm

If you could, go ahead and take pictures of your pool, and your equipment, and send them to me (poolforum@gmail.com) for a reference post.