Why do I have to lower my PH every week?

[Pfreedom]

For the past month , I have had to add muriatic acid every week to lower my PH. Is this normal?


my results today before adding MA....

FC 7
CC 0
PH 8.1
TA 60
CYA 73
CH 190

thank you!

 

[mknauss]

Welcome to the forum! :handshake:

Rising pH comes from many factors. Aeration. You have some of that with the SWCG. Any spillovers, fountains, descents, etc? Fill water. What is the pH and TA of your fill water? Are you adding more fill water?

I suggest you read Pool School - ABCs of Pool Water Chemistry and consider reviewing the entire Trouble Free Pool School book.

You may also want to get the Pool Math app.

 

[Pfreedom]

No, none of that. I have read all of those.

45 minutes after adding MA, my PH now 7.3 and TA 50

 

[mknauss]

Don't lower the pH so much. Just lower it to 7.6 when it hits 8.

Your SWCG does add aeration.

 

[Pfreedom]

We run the pump on the second speed 24/7

 

[Philo]

I go through 1/5 gal of the 31% MA a week in the Summer

P.S. 73ppm of CYA is an odd number. Leslie's?

 

[GOONiE]

I think everyone adds muriatic acid on this forum regularly. Chlorine must raise pH somewhat.

 

[Pfreedom]

I was going by the pool math app on how much to add

 

[mknauss]

Reduce your pump run time to that needed to create chlorine. The action of the pool returns disturbing the surface of the water is also aeration.

Liquid Chlorine is basic when added but is pH neutral overall. The chlorine gas created by the SWCG is pH neutral.

 

[Pfreedom]

Ok, as long as I know that is normal I will not worry too much about it.

Thank you so much!!!!

 

[Pfreedom]

I will adjust the pump run times to see if that makes a difference.

Thanks again!

 

[Pfreedom]

Typo 70