Quote Originally Posted by PoolDoc
For starters, Professor Langlier did NOT think his index was applicable to pools
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.

Again, this is an assumption on my part, but it seems to make sense.

Michael