Extremely heavy rain....effects on PH?

[john0886]

So, just wondering what most of you guys have experienced with extremely heavy rains and your PH level? I know most rain water is quite acidic, but I'm thinking (more hoping at this point) that maybe the heavy rain will help aerate the water and raise the PH a bit?

I'm in the process of lowering the PH currently, and added some acid last night to bring my ph level down to 6.8-7.0. Aerating with a shop vac, slide, and returns pointed up currently, but just wanted to see if the rain may help me out!

Thanks!

 

[mknauss]

It might. Testing is the way to find out.

Why did your pH get below 7?

 

[john0886]

It might. Testing is the way to find out.

Why did your pH get below 7?

Added around 82oz of acid last night. Tested around 6.8 after 30 mins with the pump running, though that was relatively close to where the acid was poured in.

 

[john0886]

Though it is back up to around 7.1-7.2 currently.

 

[mknauss]

Why are you so aggressively dropping your pH? Normal operations should not need the pH lowered below 7.5 or 7.6.

 

[john0886]

Why are you so aggressively dropping your pH? Normal operations should not need the pH lowered below 7.5 or 7.6.

To lower the TA. I plan on aerating to bring the PH back up to around 7.6, adding acid to drop back to 7.0-7.2, then repeating the cycle until I can get the TA in the range that works best for my pool.

Sorry I didn't state that earlier.

 

[mknauss]

No reason to aggressively lower the TA in your situation. You have a vinyl pool. Your CH is fine so no scale issues.

Just be ware that low pH is the largest threat to the longevity of your liner. Please do not lower your ph so much.

 

[john0886]

No reason to aggressively lower the TA in your situation. You have a vinyl pool. Your CH is fine so no scale issues.

Just be ware that low pH is the largest threat to the longevity of your liner. Please do not lower your ph so much.

Got it, thanks! What would you reccomend as a good minimum pH level when adding acid?

 

[mknauss]

For your situation, 7.6 is low enough.

 

[john0886]

Thanks for the help. I really appreciate it. So far, going off of the TFP method has had my pool clearer than ever. Thanks again!

 

[willygee]

Here in central fla rain raises ph...we add MA to reduce ph.