Best way to lower calcium?

[Lenny]

Michael,

I've seen some differing info about this. Acceptable ranges listed as 200 to 1000 ppm, for example.

What would you say is the acceptable range and the ideal?

Thanks,
Lenny

[mwsmith2]

For an in-ground, plaster pools, the generally accepted range is 200 - 400. As you get higher in Ca content in the water, your chances of being in a scaling condition increase. I'm about to start a ruckus with a Ca thread, so stay tuned.

Michael