Hi All!
Have a curious situation with the pH steadily increasing in my pool. First...details:
Gunite / in-ground 15000 gallon pool. Built/installed in the mid '80s (came with the house we bought!)
Attached jacuzzi with return water that spills back into the main pool
CYA = 50ppm. TA = 70ppm FC = 2-4ppm (TC matches usually as I keep on top of it) Liquid chlorination only. Hardness: Ca = 300ppm (what our tap water hardness is at)
Filter/pump on 7-8hrs/day depending on season. Cartridge filtration. Manual pool chemistry only.
Use a Taylor DPD kit for regular chemistry testing. Hach 7 in 1 strips for "quickie" testing.
I hope that's enough info.. but I've always had an issue with this pool's pH increasing in short time. I use muriatic acid to adjust down to ~ 7.4, but within ~7-9 days, the pH always increases up to >8.0. I have no idea why... and its driving me crazy because I have to dump acid into the pool on a regular basis. $$$!
I have read somewhere that "aeration" systems (e.g. artificial waterfalls, sprinklers) de-gas CO2 which can lead to pH increases. The intake from the pool is from a "creepy crawly" vacc system and skimmer. Filters.. but return water goes into the jacuzzi where it pulls in air and creates the "bubble" return.. overfill spills over the dam between the jacuzzi body and main pool, back into the main pool body. Is this the potential reason?
I was thinking of switching water return to the main pool for a week or so and testing the pH as an experiment, but that would also mean the jacuzzi is not receiving filtered water. Thought I'd probe the brilliant hivemind here on possible solutions.
What sayeth' you?
-J
Have a curious situation with the pH steadily increasing in my pool. First...details:
Gunite / in-ground 15000 gallon pool. Built/installed in the mid '80s (came with the house we bought!)
Attached jacuzzi with return water that spills back into the main pool
CYA = 50ppm. TA = 70ppm FC = 2-4ppm (TC matches usually as I keep on top of it) Liquid chlorination only. Hardness: Ca = 300ppm (what our tap water hardness is at)
Filter/pump on 7-8hrs/day depending on season. Cartridge filtration. Manual pool chemistry only.
Use a Taylor DPD kit for regular chemistry testing. Hach 7 in 1 strips for "quickie" testing.
I hope that's enough info.. but I've always had an issue with this pool's pH increasing in short time. I use muriatic acid to adjust down to ~ 7.4, but within ~7-9 days, the pH always increases up to >8.0. I have no idea why... and its driving me crazy because I have to dump acid into the pool on a regular basis. $$$!
I have read somewhere that "aeration" systems (e.g. artificial waterfalls, sprinklers) de-gas CO2 which can lead to pH increases. The intake from the pool is from a "creepy crawly" vacc system and skimmer. Filters.. but return water goes into the jacuzzi where it pulls in air and creates the "bubble" return.. overfill spills over the dam between the jacuzzi body and main pool, back into the main pool body. Is this the potential reason?
I was thinking of switching water return to the main pool for a week or so and testing the pH as an experiment, but that would also mean the jacuzzi is not receiving filtered water. Thought I'd probe the brilliant hivemind here on possible solutions.
What sayeth' you?
-J