Lowering PH without lowering TA

crookm11

TFP Expert
LifeTime Supporter
Jun 28, 2010
422
Copperas Cove, Texas
Hi everyone, :wave:

Question for all the pool gurus :whoot:

I will be adding a fountain to my Intex pool here shortly and I know from reading the forum that if you run any type of water features the PH will rise. Can you lower the PH without lowering the TA? I have read that you use acid to lower your TA and then aerate the pool to bring the PH back up. If I don't want to lower my TA just my PH how would someone do that? I ask this question because my kids are going to want the fountain on alot and I want to keep my PH consistant as posible. I know I should post my pool numbers and I will as soon as my TFtestkit-100 gets here tomorrow.

Thanks, Mark
 

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
The short answer is no, you can't lower pH without lowering TA.

The full answer is a little more complicated. You actually want to keep TA lower because pH will rise faster with higher TA.

Of course there are issues with maintaining low TA:
  • less pH buffering which can lead to wild pH swings[/*:m:gb5v77dr]
  • lower CSI would could be corrosive to plaster (depending on CH, etc).[/*:m:gb5v77dr]

Since you don't have plaster the CSI issue isn't a concern.

You could keep TA around 50-60 and to help with buffering the pH you could add 30-50ppm borates.

Also, maintaining pH around 7.8 rather than trying to keep it lower will make this easier to manage.

Your rising pH will exasperated by your SWCG.