Best way to lower calcium?

[mwsmith2]

Are your other numbers pre or post pH adjustment? If they are pre-adjustment, your water was in a slightly-scaling condition. If they are post-adjustment, your water is balanced. Basically the deal is, that if you let your pH go high, you are going to get in a scale-forming condition. That's what's causing what you are seeing. If you keep your pH around 7.4, you shouldn't have a problem.

FWIW, your Ca is not high. I qualify high Ca as 500+
. You're not there. IG plaster pools generally run 400 or so ppm as a rule.

Michael

[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