Let's get this out of the way 1st. FC 6, CC 6, TA 100, CH 500, CYA <30? (added 132 oz Bleach tonight just like every other night). It is a 17,000 gallon, gunite pool, in direct sun all day, and my primary source of chlorination is 8% bleach. We live in an extreme climate and summers are very hot with the summer months (June-Sept) well over 100 degrees and often over 115, with lots of sunshine.
I would really like to lose my "test dummy" avatar and thought I was doing pretty well, until today. I bought this house (and pool) September of last year. After having pool issues in Northern CA, before moving here, I found your site and think I have learned a lot. Our pool surface was really stained (Blue), tested at 7500 ppm TDS, smelled bad, tasted bad, and had scaling issues. In December of Last year I drained the pool, acid washed it and refilled with our city water. I did not address the scaling issue at that point. My pool looks, feels, smells, and tastes great. The only issue is I have is it seem to use a lot of Bleach, on avg. 130 oz of 8% every other day.
I know the CH is high but it's not easily solved as the tap water from the city tests at 350 ppm. I went from 350 to 500 in 6 months. I have not added anything to my water except bleach, and muriatic acid. My water is not cloudy and pump circulation appears fine. The Cyanuric Acid level is baffling though. By March I had added enough Trichlor to bring my ppm to 50. I had Leslie test it and they came up with 45 ppm so I thought that was close enough for comparison. I continued to add trichlor until May when I should be at 80 ppm, according to the pool calculator.
I had read at your site that splash out was the only way to really drop CYA levels and we don't have a lot of that. Evaporation though should be considerable. We have an auto fill device so I donít know how exactly how much there is. I searched for Cyanuric Acid Degradation and found this at your site:The primary step is the cleavage of the triazine ring and it is proposed by Wojtowicz that this primarily involves a fully chlorinated isocyanurate species Cl2CY. What? I do enjoy reading the info you have on chemistry and actually understand some of it but, WHAT?
Any thoughts? All help would be appreciated.