Reef Crystal IO salt

[67Stang]

I mixed an entire bucket of Instant Ocean Reef Crystals with fresh RO/DI for my new tank and my Calcium was only 370ppm. (API test kit)

I found a thread on Reef Central about some suspect or bad batches:
http://reefcentral.com/forums/showthread.php?t=1298050

Originally Posted by Coleus

Yesterday, I mixed my Ro/di fresh water with Instant Ocean Reef Crystal. Got the salanity to 35ppt (1.026) and temp is 79F and did some water testing. I found the parameter is not what it claims on the bucket

The claim:
Cal : 455ppm
Mg: 1345ppm

Well the result i am getting from my Salifer Test kit is

Cal: 400 ppm
Mg: 1230 ppm

Anyone knows why?

Thanks