What makes CH climb?

svenpup

LifeTime Supporter
Nov 18, 2009
835
Sacramento, CA
CH will rise if you add products with calcium such as cal-hypo.
CH rise through normal evaporation and water replacement if your fill water has high calcium.
 

benavidescj

LifeTime Supporter
Apr 27, 2010
431
Fleming Island, FL
Guess I should have added more information. I have a SWG, so my chlorine comes from that. I do not have a lot of calcium in my supply water, maybe about 150 ppm or so. My pool is new though and is a pebble finish. Could this be it?
 

chem geek

TFP Expert
LifeTime Supporter
Mar 28, 2007
12,082
San Rafael, CA USA
The first weeks to month are the fastest, but it keeps curing at a possibly noticeable rate for 6 months to a year. After that, it's usually not that noticeable though it still technically cures very slowly.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
CH of 150 in your fill water is significant. No calcium is ever lost through evaporation. Then, when you top off the water level, you are adding new CH. Unless you never add water to the pool, the CH level will continue going up every time you add water.
 

benavidescj

LifeTime Supporter
Apr 27, 2010
431
Fleming Island, FL
Not what I wanted to hear :( . So at some point, maybe CH 600 ppm, I am going to have to start diluting the water by drain and fill? Is this normal maintenance to have to reduce CH every once in a while?
 

dmanb2b

TFP Expert
LifeTime Supporter
Apr 4, 2009
3,734
NY
Once the curing slows down, with fill water CH of 150, it would take 3 full pool volume evaporations for your CH to rise that much...your talking maybe 4-5 years and even CH of 600 is manageable, as long as you keep your PH below 7.8 at all times.
 

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