rising ph levels

[jereece]

.04/day is about .3/week and that seemed to be around what you were seeing. In your post #13 you said that the rise in pH was ".2 to .3 units per week" so aren't we consistent?

You are correct. I misread and thought you said .04 per week. Sorry, you are correct. That is about right.

The MSDS for 5.25% bleach says the pH is 11.4.

I think what I need to do is check my pH, add bleach and let circulate for an hour, check the pH again then the next day when chlorine concentration has decreased check pH again. It may be difficult seeing any change however with my test kit.

[chem geek]

The MSDS for 5.25% bleach says the pH is 11.4.

Well, if the 5.25% means the weight percentage of sodium hypochlorite then the natural pH would be 10.5 and the amount of base added to make it more stable (if any) is much less than what is in 12.5% liquid chlorine. So that isn't what is going on. Too bad since that would have been an easy answer.

Richard