How to determine Total Hardness in saltwater aquarium

dbdisok

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I am having difficulty with determining the Total Hardness in my saltwater aquarium.

I have been using an eXact iDip 570 testing system for many years. You test dKh, CAL and Total Hardness. The device/app then uses CAL and Total Hardness to give you the MAG level.

My device has been returning a "Lo" reading for Total Hardness and so no MAG reading. Today my dKh was 7.62 and CAL was 455.20.

Today i used a Salifert MAG test which gave me 1350 ppm result.

What is another test for Total Hardness?

Thank you in advance.
 

Randy Holmes-Farley

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Don’t bother. It is a weird mathematical mix of magnesium calcium and strontium in units that are only interpretable to a chemist.

If you can’t make the idip work, get a magnesium kit, or better yet, don’t measure it at all.

 
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