We decided to let our pool service company go last year. I had been using the local pool store for testing all winter. The CYA has been high, so I started doing research on what that was and how it got there and ended up on this site. I just received my TF-100, so trying to get the pool under control. Here are the numbers from the latest pool store, and what I got last night
pool store 3/17
my test 3/26
CYA 80, around 70-80 when I did the 2:1 diluted test
It is a 30,000 gal pool with a waterfall on the spa and three water features. Gray Sunstone quartz aggregate plaster. Dallas, TX with about 30% shade in the summer time.
I am trying to get the FC up, I found some discontinued 10% bleach ot Lowes for $1.25 gallon, it is just over 6 months old (8/14), and it seems to be a little weak based on the pool calculator. We have had some very sunny days with wind blowing leaves in the pool, so not sure how much FC is being lost naturally in the pool yet. I'll dump a whole gallon in tonight and see what the FC looks like first thing in the morning.
A few questions:
I plan on draining the pool next weekend about 1/3 to 1/2 to reduce the CYA. Is the best way to drain it using the backwash with only the main drain turned on?
Is there an easy way to tell when I get it down to about half full? I don't want to take too much out, we have water restrictions here. But I don't want to have to drain it again either. The pool is kind of L shaped, about 4' deep on one end and around 12' deep on the other. I can get out the tape measure and calculate volume if I have to.
Should I be concerned with the ground water level when draining? We had a pool leak fixed last year, and they had to drain a 2-3 feet out to fix it, and it took several hours. Plus we had the pool replastered about 3 years ago without issues.
After I refill the pool, I need some advice on how to rebalance the pool. What needs to be done first (guessing chlorine, Ph level , alkalinity and then calcium)? And how much time do you wait before adjusting each? The water report for our area shows the calcium hardness levels around 100-150 range.