My plaster pool with a SWG was always running up the pH. If I balanced it down to 7.5, it would raise to 8.0 in 2-3 days. I could add a cup or two of acid daily.
I recently did a drain and refill for maintenance, and this time, I switched to a full BBB using bleach versus SWG to see if there was a difference. Of course, I need to add bleach every day, but my thinking was that I could run it without salt for a month or two and have some comparison. Net, I can always add salt - it's tough to take it out. I have noticed the pH rise going up more slowly, so that's a good outcome. Now, I am adding about 2 cups every 4-6 days.
I have a hypothesis that I wanted to run by the forum. My pool has an attached spa with a overflow from the spa to the pool. Since the controls are manual, the pool was set to feed both the spa and pool the entire time the pump was running; therefore, the spa overflow is always running. Now that the pool uses bleach, I am not running the pump as long (6-7 hours versus 12 hours). Here's my question: can the quick pH rise be attributed to the aeration of the water versus the use of SWG?
These past few days I have turned the spa return off and noticed very little change in the pH. But it will take a much longer test to tell for certain, as rain and sun will create variables that can affect the balance.
I do travel for a living so it's not practical for me to do daily monitoring, which is why I opted for the SWG. I don't want to use tablets, and we are heading into the 80's-90's here in central Texas now so the balance demand is only going to go up. I'm looking for the best set up that will work for my lifestyle.