New to the site and really appreciate it. Thanks!
pH - 7.5
TA - 110
FC - 7 (but falling fast)
CC - 0
CH - 100
CYA - 80
Pool is amazingly crystal clear but it is gobbling chlorine...about 15 ppm per day (including 5ppm at night per the FC night test)
I've been busy (too busy perhaps) the past few days
1] added 45 pounds baking soda (all at once) to get TA to 150 per pool store recommendation (before finding this site)…pool turned green for a couple days
2] stains appeared all over the pool, which I diagnosed as metal stains with Vitamin C tablets (metal stains presumably caused by huge pH/TA swing from all that baking soda all at once)?
3] removed the stains with 10 pounds citric acid and 2 pounds ascorbic acid…prepping the pool with 3 pounds chlorine neutralizer and some muriatic acid to lower pH to maximize impact….this made the pool look amazingly good
4] added 1.5 quarts sequestering agent
4] received my TF-100 test kit
5] brought pH back up with 3 boxes Borax
6] added 6 more boxes Borax (and a gallon muriatic acid) to get Borate level partially up
7] drained 25% of the pool to help bring TA and CYA down…replacing water with my well water (TA=120, pH 7.5)
8] reduced TA with muriatic acid (2 gallons) and aeration
- My numbers are under control (but I'd like to get CYA down even further)….everything above seems to be working.
- The pool is beautiful (moreso than ever…)
- The pool is consuming chlorine at a scary rate. Major Chlorine Demand issue.
What could be causing the very very high chlorine demand?
- well water (nitrates? Phosphates?)
- phosphates (from sequestering agent)
- chlorine still working on all that citric/ascorbic acid
- chlorine still working on all that neutralizer
- muriatic acid?
I am puzzled that I keep getting the CC=0 reading.
I read that I may be able to "shock my way out of this" but I haven't shocked yet since the post for the ascorbic acid treatment said I can't shock for 2 weeks.
My current plan is to just keep "feeding the beast" 3 gallons of 12% liquid chlorine every day and hope that this issue resolves. If it doesn't, then I plan to shock the heck out of the pool, per the shock value on the CYA table.
What else should I be looking for or trying?