spa ph?

[marty]

Looks like over 5.10 cl can this make my ph low? Super yellow. I have been adding handful of sodium bicarb every week!

 

[jblizzle]

What are you using to add the FC?

Dichlor/trichlor are very acidic and can result in low pH.

EDIT: also baking soda has very little affect on pH, it is used to raise TA. You should be using washing soda/soda ash or borax to raise the pH. Review: Recommended Pool Chemicals

 

[chem geek]

A high chlorine level can give a falsely high pH reading, but if you are getting yellow then the pH is truly too low. This looks like a Taylor kit so is it have a base demand test? If so, then it can give you an idea of how much pH Up you would need to raise the pH, though you could overshoot your TA so be careful. If you have a Taylor K-2006, use it to give us a full set of water chemistry parameters and we can help you raise the pH without overshooting TA -- basically using pH Up to get the pH/TA up and then if the pH need to be raised further, aerating the water by running the jets.