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RogerI agree. There is no need to raise calcium hardness in a spa. I never added calcium until recently. My dealer also agrees there is no need. I now raise it only to 100 to give my water a little more polish. Don't even know if it really does that.
So why is it that dealers/etc are so quick to strongly advise against filling a tub with softened water? Is it the sodium, or other ions used to soften the water, or is it the lack of minerals other than Ca that are a problem?Funny that we have two nearly identicel threads going now........
I am not a chemist, so forgive me if what I say is not totally exact.2 reasons for calcium hardness:1. Soft water foams. Often foaming issues are really soft water issues, not from lotions, soaps, etc.2. You Taylor Test Kit fans should know this one (unless they have changed their instructions and support documents). Water balance is the relationship of at least 4 factors, temperature, pH, TA and Calcium Hardness. If your hardness is low, then, according to the Langlier (sp?) index the industry uses, your pH and TA have to be adjusted accordingly. pH bounce could be the result, as you would think your TA is in range, but it really isn't.Does this begin to answer the question?