about my calcium test- re :earlier post

[asherah]

Well I found out that IslandReefer was right. Mg/l is the same as ppm

"you don't. mg/L is the same as ppm.

1 mg = 0.001 g
1 l = 1,000 ml.
Remember that 1 ml = 1 g of water, so 1 liter = 1,000 grams (of Water).

Again:

0.001 / 1,000 = 1/1,000,000 = one part per million ."
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Found that on another site.
So I guess that means that my calcium is 500ppm...isn't that a bit high?
thanks
asherah