Calcium Hardness


New member
Apr 25, 2020
Ocean Springs, MS
I have a little Intex Prism, just filled it yesterday. I let it sit over night and most of today just allow everything to kind of "settle" - I don't know if that is required, but it seemed like a good idea at the time. Anyway, I tested it today and I'm ok with everything with one exception. The calcium hardness test: 25 mL water (filter has been running for about an hour, no chemicals added yet) 20 drops of R-0010, mix; 5 drops of R-0011L, mix; then count the drops of R-0012 to get to blue. The sample was blue after R-0012 - the same is true for the water from the faucet. Is this an issue? How do I correct it?


Gold Supporter
Bronze Supporter
Jul 17, 2019
Prosper, TX (DFW)
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
With a non-plaster pool, I wouldnt worry too much about Calcium Hardness being on the low side.
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