Hello,

I have a 33,000 gal. IG vinyl pool with SWG. It was install at the end of season last year so this is our first opening. So far, so good. We have a propane heater on the pool - young kids and it helps take the chill off after cold nights up here in NH - Anyway, I was told that I need calcium in the water to maintain and extend the life of the heater. It's a Hayward H400. I know my calcium is at 0 right now and I have hesitated listening to my pool people as I have read so many times that a vinyl pool does not need calcium. OK, so my pool may not need the calcium, but does my heater? Should I keep a certain level of calcium in the water for the heater? What would be the logic to adding calcium with the heater?

By the way, I have been using the three B's system and the pool is in great shape!

Thanks!
Tracy