Why is my pH always rising?

I had this exact issue when I first switched to a saltwater system. Turns out the process of generating chlorine also creates small bubbles that cause pH to rise through aeration. I kept adding acid and wondering why it wouldn’t stabilize. What helped me was dialing back my total alkalinity and running my water features less when I didn’t need them. Also, double-check your fill water mine was naturally high in pH, so every top-off made it worse. Now I test a couple of times a week and only have to adjust pH once in a while instead of constantly fighting it.
 
The same thing happened with my pool for a while, and it drove me nuts. For me, it ended up being the type of chlorine I was using, switched brands and noticed the pH started creeping up more than usual. Also noticed it got worse after I scrubbed the walls more often (guessing it stirred things up somehow?).

I didn’t even think about that till I stopped cleaning for a week, and the pH stayed steady. It might be worth keeping a log to see if it lines up with anything you’re doing regularly.
 
Great tips, everyone! I’ve also had issues with rising pH, and I realized it was partly due to using a new filter. Sometimes just cleaning the filter or switching to a new one helps reduce the pH swing. Anyone else notice that their filter makes a big difference?
 
I’ve noticed pH creeping up in my pool too, and it’s usually a mix of aeration and water source. Even sunlight and temperature changes can make it drift faster than expected. My trick was to dose small amounts of acid regularly, rather than one big adjustment, and check the filter, sometimes a new or freshly cleaned filter changes the water chemistry a bit.
 
I fought this for most of one season and honestly thought I was doing something wrong every time I tested. pH would look fine, then two or three days later it was climbing again and I was back with the acid. Super annoying. In my case the real problem wasn’t the acid, it was everything else quietly pushing pH up in the background.

The big one for me was aeration plus a slightly off alkalinity floor. Returns pointed up, lots of bubbles, and a decent bather load on weekends. That combo just kept driving CO2 out of the water, so pH naturally rose no matter what I added. I kept correcting pH directly instead of fixing alkalinity first, which just made the cycle repeat. Once I slowly brought alkalinity into range and stopped blasting air into the pool all day, the rise slowed way down.

I also learned to stop reacting to every test. I started doing quick midweek checks with the aquadoc eagle ray just to watch trends, not chase a single number. If pH was drifting, I’d make a small adjustment instead of dumping acid. After that, the constant creep finally calmed down. Its still a little upward over time, but now it feels normal instead of a full-time job. Anyone else notice it’s worse right after heavy use or lots of bubbles?
 
Camila Rivera said:
Check if you have too much aeration. That can raise pH fast.
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Camila Rivera’s point about aeration makes sense and I’ve seen the same thing. When there’s a lot of bubbles and water movement, the pH keeps climbing even after lowering it. Once I reduced the extra splashing and agitation, I didn’t have to add acid nearly as often.
 
Ryan Brooks said:
I had this exact issue when I first switched to a saltwater system. Turns out the process of generating chlorine also creates small bubbles that cause pH to rise through aeration. I kept adding acid and wondering why it wouldn’t stabilize. What helped me was dialing back my total alkalinity and running my water features less when I didn’t need them. Also, double-check your fill water mine was naturally high in pH, so every top-off made it worse. Now I test a couple of times a week and only have to adjust pH once in a while instead of constantly fighting it.
Click to expand...
What Ryan Brooks mentioned about certain systems adding extra aeration is exactly what surprised me. I didn’t realize how much tiny bubbles and constant circulation could slowly push pH up. Once I stopped overcorrecting with big acid doses and focused on stabilizing alkalinity, I wasn’t chasing it every few days
 
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