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Old 01/11/2008, 08:55 PM
m2434 m2434 is offline
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Join Date: Jan 2004
Location: Boston, Ma
Posts: 1,119
Reef Crystals shouldn't raise your ca that much. I suspect there is something else happeing. Are you sure you are measurig salinity correctly - are you using a calibrated refracometer? The only way I can see it raising it that much is if your salinity is if your salinity is really high.

For example, I belive reef crystals hovers around 450ppm ca at s.g. 1.025. To raise your ca, it would need to be over 525. It depends how much water you are adding, but for example, to get 600ppm, the salinity of your top-off water would need to be approx. 1.033.

The other possibility is a testing error...
Some people say, "How can you live without knowing?" I do not know what they mean. I always live without knowing. That is easy. How you get to know is what I want to know. - Richard Feynman