Should I worry about pH of 7.4 in saltwater pool?

[Whynotme]

pH was around 8.0, so I added some dry acid. Apparently too much because now pH is 7.4 and alkalinity is 90-100. Alkalinity was 110 prior to adding dry acid. Can't tell if currently 90 or 100 because the sample changes color about halfway with the 9th drop, all the way with 10th drop. Taylor 2006. Do I count that as 90 or 100? Anyhow, my primary question is should I add some baking soda or soda ash to raise the pH to around 7.8? Saltwater pool that I won't close until water temp hits 60 and stays there for a week, so it should be running for another couple of weeks at least. I know salt pools tend to have creeping pH anyhow, so should I worry about 7.4?

Most recent test - FC11, CC0, TC 11. pH 7.4 Alkalinity 90/100, CYA 70, CH 170. Calculated CSI in pool math app is -.760, so I'm concerned about that. Before I added dry acid my CSI was -.25. thanks all

 

[mknauss]

Anyhow, my primary question is should I add some baking soda or soda ash to raise the pH to around 7.8?

No. The pH is fine. The TA level will force the pH back higher soon.

It is not advisable to add dry acid to a pool with a SWCG. The sulfates in the dry acid can build up and they damage metal -- ie the plates in the SWCG that create the chlorine.

 

[Whynotme]

No. The pH is fine. The TA level will force the pH back higher soon.

It is not advisable to add dry acid to a pool with a SWCG. The sulfates in the dry acid can build up and they damage metal -- ie the plates in the SWCG that create the chlorine.

Did not know that, will start using liquid moving forward. Thanks for the tip and reassurance.

 

[Whynotme]

No. The pH is fine. The TA level will force the pH back higher soon.

It is not advisable to add dry acid to a pool with a SWCG. The sulfates in the dry acid can build up and they damage metal -- ie the plates in the SWCG that create the chlorine.

Sorry, also, should I not be concerned about the CSI of -.7?

 

[mknauss]

Sorry, also, should I not be concerned about the CSI of -.7?

You have a vinyl pool. CSI does not apply to you. Turn off Track CSI in Poolmath.

 

[Whynotme]

You have a vinyl pool. CSI does not apply to you. Turn off Track CSI in Poolmath.

Had no idea. I did know calcium hardness is unimportant for vinyl pools but didn't put 2 and 2 together. Thanks