Last week we purchased a home with an inground pool and now that we are settled a bit I'm ready to get started on my pool maintenance. I bought the Leslie's Total DPD Test kit and did a test last week. The CYA was measuring off the chart but everything else was within range. I took a sample up to Leslie's and had it tested to double check my numbers and the kid said everything was good to go and within range (said the CYA was at 60). Since we were moving I have not had much of a chance to mess with it again until today; the water is clear and the pool looks good. I did another test and got the following numbers:
FC - 0
TC - .5
pH - 7.8
TA - 120
CH - 310
CYA - 100+
Since I'm new at this and don't totally trust my testing abilities yet, I then decided to take another sample to TexSun and they tested it with their machine and got the following numbers:
FC - 0
TC - .5
pH - 7.9
TA - 108
Adj. TA - 63
CH - 274
CYA - 151 (she said it was as high as their machine would go)
TexSun was who the previous owners had used to maintain the pool so I asked about the high CYA and the affect on chlorine; she said "some manufacturers will tell you that." It looks like they have a more accurate testing method, but my faith in their information is quickly diminishing. To get back in range, she suggested 12 pounds of BioGuard Balance Pack 100, 2.5 pts of muriatic acid (split over the course of two hours), and 2 bags of "multi magic" shock.
I went ahead and bought the muriatic acid and got 2 182oz jugs of Clorox regular bleach on the way home.
I added 1 jug of the bleach about 30 minutes ago just to get some chlorine in there. The pool calculator show that I should put in 18oz of muriatic rather than the 2.5 pints the pool store recommended. I know with the CYA that high it will require a significant water change to get it down, can this be achieved over time with backwashing if I use bleach? We are also not getting much rain and its been plenty hot, so I suspect I'll be adding water frequently. Also, I'm not real clear on the TA and Adj. TA - should I add some type of Alkalinity up?
Any recommendations are greatly appreciated.