CH level range discrepancy

Nordy-que

Active member
Apr 2, 2021
33
Florida
Pool Size
13000
Surface
Plaster
Chlorine
Liquid Chlorine
Just wanting to understand why TFP recommends a CH level that is quite a bit higher than what I've seen elsewhere. My pool warranty sheet, for example, gives a range of 200-400, while Poolmath is saying 250-650, with 350-550 being ideal. Mine is at 300. I'm inclined to stay there unless there is a really good reason to go higher...
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,346
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
The Recommended Levels, specifically for plaster pools, are designed around maintaining a safe CSI level so that the water is neither aggressive to your plaster finish nor in the scaling tendency range. The wide ranges TFPC has for the levels allow more flexibility in achieving those results.

Your level of 300 ppm CH is in range. No need to change it.
 
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Nordy-que

Active member
Apr 2, 2021
33
Florida
Pool Size
13000
Surface
Plaster
Chlorine
Liquid Chlorine
The Recommended Levels, specifically for plaster pools, are designed around maintaining a safe CSI level so that the water is neither aggressive to your plaster finish nor in the scaling tendency range. The wide ranges TFPC has for the levels allow more flexibility in achieving those results.

Your level of 300 ppm CH is in range. No need to change it.
Makes perfect sense, thanks!
 

Sanford35000

Member
Jun 23, 2021
20
Sanford NC
Pool Size
35000
Surface
Plaster
This is confusing to me also.

The recommended range for CH on other pool web sites and test strips is ridiculously inconsistent:

clorox test strip: 175 -275
hth test strips: 200 - 400
blog.intheswim.com: 180 - 220
swimuniversity.com: 200 - 275
ultimatepoolcare.com: 200 - 400
taylortechnologies.com:200 - 400
troublefreepool.com: 250 - 650


The above ranges are for a concrete or plaster pool.


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