Low pH and high Alk

[jbilliel]

I opened my pool for the year and its been running for 2 weeks. It's crystal clear and ran all my tests this weekend, but not sure what the right approach should be to correct the pH without adding more Alk. Any thoughts?

pH - 6.6
Alk - 90
FC - 6.0
CA - 30
CH - 75

This is an above ground vinyl pool so I am not super concerned about the high alk, but if I add soda ash or baking soda with all add both pH and Alk.

 

[Flying Tivo]

How did you measure 6.6 Ph? Alk is fine. Just aerate to bring PH up. Are you using Pucks?

 

[jbilliel]

pH was measured with the TF100 Test Kit. I am not using pucks. Just liquid chlorine...

 

[Flying Tivo]

pH was measured with the TF100 Test Kit

It only goes low to 6.8! Maybe you are extrapolating? But what matter is that its low. Aerate to raise ph!

 

[pjt]

pH was measured with the TF100 Test Kit.

For the pH test in the TF-100, the bottom end of the scale is 6.8. How are you measuring 6.6?

How/why did the pH get that low?

With a TA of 90, your pH won't stay low for long. Aerate to speed up the pH rise.