Absolutely spot on, as usual. The index (and I'm just repeating this for the folks who don't know) was developed to keep boilers from corroding/scaling. In other words, it needs heat for it to be applicable. I'd say though, if you have a vinyl pool AND you have a heater, you're going to have a calcium requirement...because then you have a "boiler" that you are dealing with.Originally Posted by PoolDoc
Again, this is an assumption on my part, but it seems to make sense.
Michael
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