Why does pool school recommend higher CH for Salt water pools?

ComputerGuyInNOLA

LifeTime Supporter
Oct 20, 2012
648
Mandeville, Louisiana
I have been keeping my CH around 250. I just looked through pool school again as it has been a while and saw that for salt water pools the recommended range is 350 - 450? What is the reasoning behind the higher CH level for SWG pools vs non salt water pools?
 
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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
15,884
Tucson, AZ
Because for many SWG owners, you want to keep your TA and pH lower to avoid scaling. In a plaster pool, managing CSI (calcite saturation index) is very important. A higher CH allows a plaster pool owner to keep the TA lower which slows the rise of pH over time. That helps to reduce the amount of acid needed over a season to keep pH in check.
 
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