I overheard a pool store guy telling this gentleman all the things he needed to buy for his pool to fix his water. He just lost his old pool guy and doesn't have a new one starting until next month so he's trying to maintain it until the new guy starts. He told the clerk helping him to give him a minute so he could read the labels on everything he was telling him to buy and he walked to the side. I couldn't take it anymore so I walked over to him and mentioned this website. Turns out he's not a computer guy which I took as he doesn't have a computer. I offered to try and help him.
He gave me his test numbers, these are pool store numbers, however, it's the only pool store whos numbers I trust. Just for kicks whenever I buy acid or we're going to be in the area I'll test my water, then take a sample by this store and have them test it. They're consistently very close if not exactly to my numbers. I did one of these comparisons as recently has Thursday when I was doing a CYA test. We both got the same numbers on all tests so I feel good about his numbers. His pool is about plaster, 20,000 gallons and he believes built around 1990, sounds as if it's new to him:
FC - 10
CC - .2
CH - 500
CYA - 120
pH - 8
Numbers we usually don't look at here
Phosphates - 0
Dissolved Solids - 3300
His new pool guy has told him he needs to drain his water for him, guy at pool store also told him he needed to drain his water. Both are focusing more on the hardness vs. CYA and when they've told him they need to drain it they're talking about COMPLETELY drain.
So two questions. To my novice eyes I'm thinking drain a little to get the CYA in check, it will lower the hardness a little and he should be good to go. However, I'm a novice no expert and outside of adjusting CC, pH I'm not qualified to give advice. What do you guys think? He really seems to be worried about draining the pool completely this time of year as we're in Vegas and it will be 90+ and sunny for the next 4 - 5 months. If he has to drain his pool he could cause some damage, correct?
I'd really like to help this guy, he really seemed overwhelmed and was about to spend hundreds of dollars at the pool store. Thank in advance for any advice.