Calcium and hard water

[aylad]

Ben (Pooldoc) has a method he's been working on to remove the calcium from high-calcium water, but he's the one that would need to explore this with you....sit tight, and hopefully he'll be by soon...

Welcome to the forum!!

[PoolDoc]

It's done:
http://www.poolforum.com/pf2/showthread.php?16992

For what it's worth, this is the ONLY practical way to solve the problem, when your fill water is already out-of-bounds.