I am confused about what the correct units are regarding calcium chloride.
I have seen the “acceptable range” for calcium choride as
“50-150 ppm” but is that in units of “ppm as CaCO3” or “ppm Ca+2”?
My understanding is that:
the ratio (ppm Ca+2)/(ppm as CaCO3) is 0.4
and
1 gram of CaCl2 2H20 in 1 gallon of water adds 72 ppm Ca+2.
I dug. The units that apply when stating a ‘usable’ range such as ‘50-150ppm’ are Ca+2 (the ion), not “ppm as CaCO3”
