SWG is not making pH go up

[chem geek]

Steve,

You list that you have a "waterfall" in your pool. By any chance, is that waterfall being run less when you turned on your SWG? The waterfall would do a lot of aeration and cause the pH to rise. Over time, the aeration plus acid additions would cause the TA to drop and there would be less and less pH rise over time, but this would take a long time to accomplish. Was there anything else that changed, including chemical additions, the TA level, or the pH? If you turned on your SWG and found the pH to be more stable, then that is indeed out of the ordinary (based on posts from users) and would be useful to figure out.

Richard

[cschnurr]

Richard,
Without trying to hi-jack this thread, I would like clarifcation one of your previous posts. You mentioned that

"A low TA (adjusted for CYA) could help explain your lack of pH rise"

Where can I find info on this adjustment and does my Taylor K2005 measurement already include this adjustment.

Thanks
Carl

[waterbear]

The CYA adjustment forumula is included in the back inside page of the booklet that came with your Taylor kit. To simplyfy it just subtract 1/3 of your CYA reading from your TA reading if your pH is between 7.4 to 8.2 and subtract 1/4 of your CYA reading from the TA reading if your pH is 7.0 to 7.2. The result with give you your adjusted TA. It will be close enough!

[steveinaz]

Steve,

You list that you have a "waterfall" in your pool. By any chance, is that waterfall being run less when you turned on your SWG? The waterfall would do a lot of aeration and cause the pH to rise. Over time, the aeration plus acid additions would cause the TA to drop and there would be less and less pH rise over time, but this would take a long time to accomplish. Was there anything else that changed, including chemical additions, the TA level, or the pH? If you turned on your SWG and found the pH to be more stable, then that is indeed out of the ordinary (based on posts from users) and would be useful to figure out.

Richard

The only time we run the waterfall is when we are swimming, to keep people from stubbing a toe on the floor jets. We haven't done anything else different aside from stopping use of Clorox. Maybe it's just a coincidence of my TA slowly lowering?

My last TA reading (done 2 weeks ago) was 140. Using waterbears formula for correction, that would put my corrected TA at apprx 122. (Given a CYA of 55ppm). Don't know if that helps...

Latest:
FC 7
CC 0
PH 7.6 (maintained thru adding 1 cup muriatic a week)
TA 140
CH 295
CYA 55