Ph
- Thread starter Maggiekeltz
- Start date
- Jul 21, 2013
- 54,831
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Welcome to TFP.
Jets cause aeration and aeration causes pH to rise.
What is the TA of your water?
I suggest you read ABCs of Pool Water Chemistry
Jets cause aeration and aeration causes pH to rise.
What is the TA of your water?
I suggest you read ABCs of Pool Water Chemistry
TA IS 40. I know aeration causes pH rise but it seems to happen very quickly. Borate level is 40.
What is your PH? It will rise after use with the jets on but should fall after sitting idle for a few hours. Some spas seem to mix air in during recirculating which makes things a bit tough. What are you using for a test kit?
My pH rises from 7.4 to 7.8 in less than 1 week. Borate is 40, TA is 50. I am using the Taylor test kit.
- May 23, 2015
- 24,651
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Stop dropping the pH so far. 7.4 is the urban legend “optimal pH” but that is simply not true. When you lower pH below 7.5/7.6 with water that contains carbonate alkalinity, you drive the formation of a lot of aqueous CO2 which then gets driven out by aeration. That is the source of your pH rise.
Aim for a pH of 7.6 and don’t reduce it until the standby (resting) water pH goes above 7.8. Then only knock it down to 7.6. You can also safely raise your borate levels to 50ppm or more (i use 60ppm in my swimming pool) to help hold down the pH. Keep your TA at 50ppm.
Aim for a pH of 7.6 and don’t reduce it until the standby (resting) water pH goes above 7.8. Then only knock it down to 7.6. You can also safely raise your borate levels to 50ppm or more (i use 60ppm in my swimming pool) to help hold down the pH. Keep your TA at 50ppm.
Similar threads
