Help me stabilize my rising pH?


LifeTime Supporter
Mar 10, 2008
Lafayette, LA
My pH is constantly on the rise. Not sure exactly what the trend is due to the fact that I work away from home for 30 days at a stretch. I just know that it is beyond 7.8 when I get back.
IIRC from the last time I was in, it wasn't unusual to see it raised by .4-.5 in a 2-3 day period. I'll keep a better journal over the next couple weeks to see what it's doing.
For right now, I'd like to get you guys to look at my numbers/timed events and tell me if there is something that I should adjust in order to minimize the effect.

Aeration affects pH, right? I have 3-18" sheer descents, a spillover spa, and 2 sprays for the tanning ledge. The sheer descents and sprays are timed to run 2 hours a day. The spa spills over as a return for the pool for 6 hours in the am, and 4 hours in the evening. The spa runs it's jets for 4 hours in the morning. This scenario was programmed by me as a means to "keep everything functional" while this house sat vacant through the spring. Now that I look at it, I'm thinking I need to trim this back.
How would you run the filtration timing in busy season? I'm thinking it's a fairly light load, 1-2 adults with a 4 year old kid a couple times a day for a couple hours at a stretch. We run the pool filter while we swim.
I should probably ditch the water features timing segment, but it's nice to wake up to the sound in the morning. Is 2 hours a day going to have a big effect on the pH? I could live with turning them on manually I suppose.
I think I will cut the spa's timed segment down to 15 minutes, (just to exercise the valve everyday) instead of 4 hours.

Onto the chemistry...
Current pH is 7.3, have been dosing it with 31.45 MA over the last few days to get it where it is.

FC was 3 at 6 pm today. I shocked it with 48 oz of 48% Cal Hypo last night as a final shock for an algae bloom I was dealing with. Should have brought it up to about 11 over night.
CC is zero, water's clear now.

CYA was very high 6 weeks ago, 90. It was zero when I got back from work. :shock: I have an autofill, and there has been some heavy rains but I'm still not sure where it went. I did take over a foot of water out of the pool as I was vacuuming, so that would dilute it quite a bit, but it was still hard to believe zero. I have tested, retested, and ordered more reagents.
I used about 5 di-chlor pucks over the last week and it was about 15 this afternoon. I added about 8 oz of Balancer into the AquaGenie dispenser this evening to boost it up a tad bit more.

CH is 260, TA is 95.
I don't have a test for borates, but I haven't added any. Should I? They can help stabilize the pH right?