Calcium hardness question: to add or not

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CFlaPool

CFlaPool

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Apr 21, 2021
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Satellite Beach, Florida
Pool Size
20000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
My mother-in-laws pool has the numbers below. Plaster pool, 18,000 gallons, resurfaced 6-9 months ago, uses liquid chlorine. CSI is good, but I fear CH is too low. Would you raise the CH to 350? Here is link to poolmath pool. PoolMath Logs



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With copious amounts of rain I would raise it above 350 as it will forever be dropping.

*providing your fill water is low CH.
 
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Newdude said:
With copious amounts of rain I would raise it above 350 as it will forever be dropping.

*providing your fill water is low CH.
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Yes, our city water is not hard at all. Her pool has a plugged main drain due to leaks, and her El Dorado pool cleaner is always in the skimmer. Are there any issues getting the calcium to dissolve properly?
 
CFlaPool said:
Thanks. 20lb added. It dissolved quickly with a little brushing. I’ll retest Friday.
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Tested today. 250. So it must have been 175 last week. It went up 75 with 20lbs. She has been adding soft city water due to no rain, so that could be why CH did not increase as much as expected. Also, I think the pool may be more like 17000 instead of 15000. I’ll put in another 20# bag of calcium this week.
 
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