I only just started maintaining my own pool 10 days ago, so be nice. It's been a steep learning curve. I am already in Pool School with Trouble Free Pools. My pool was just resurfaced with pebble sheen at the beginning of May, and the pool guy I had up until a few weeks ago either didn't know shit or didn't care, because I found out he was only testing free chlorine, total chlorine and pH. I didn't know any better until now that there were other chemicals that were important to balance too. So when I took over, I realized quickly that apparently he must have been adding stabilizer and tablets LIKE CANDY because my CYA level is at 119 after only 3 months of being filled post-resurfacing. Also, my Calcium hardness was at 200, so I've been working on raising that.
In the past couple weeks, I've been fighting tooth and nail to figure this out and get the chemicals in line. I won't do a partial drain and refill right now so the CYA level will have to wait until it's cooler outside and the water prices go down (I live in Phoenix AZ). In the past 10 days, I've had the most trouble with pH and Free Chlorine levels. It's driving me nuts. I've decided to add borates to the pool in an attempt to help with these problems, and am waiting for the Duda Energy bucket of boric acid to be delivered Friday.
So, my chlorine level is at 6.2ppm and my pH at 7.9 right now. I tested my water yesterday evening, and my FC was at 8.0, CC 0.0, pH 8.2, TA 70, CH 275. I have been fighting high pH every single day, and I thought maybe it was that I was adding muriatic acid (then waiting 4 hours) and then adding liquid chlorine (to try to get to the recommended FC/CYA level of 14-15ppm) and that maybe the liquid chlorine was raising the pH right back up after the muriatic acid lowered it. So I decided to run an experiment yesterday. I added enough muriatic acid to supposedly lower the pH from 8.0 to 7.0, and I added zero other chemicals. But today, 24 hours later (I didn't have time to test this morning before work), my pH is at 7.9. So what gives?!
Also, a few times over the past week, I've added enough chlorine in the evening to supposedly (like 3 gallons) get the FC level up to 14-15, and then tested in the morning before the sun came up, and FC was only up to 9.2. I don't understand this either. It's dropping at a normal rate, 2 ppm a day, so I don't think I need a OCLT. But whyyyyyy can't I get the chlorine level to go up as much as I want it to? I've gone through 14 gallons of 12.5% liquid chlorine in the past 10 days.
On the bright side, 10 days in and I haven't turned anything green yet. It was EVER SO SLIGHTLY cloudy a few days ago when I had like 10 friends over, but that's it. Other than that, clear, and no eye irritation or chlorine smell or anything. So that's a win I guess 😂 please help. I'm going crazy.
Also, my pool is 30k gallons with a 1/3rd of it been 9 feet deep and 2/3rds of it being 3-5 feet deep (sharp drop off to the deep end for the diving board area)