How to determine Total Hardness in saltwater aquarium

[dbdisok]

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]

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.

Just say NO to magnesium testing: RMM is born

OK, this thread has been many years in the making, and I'm posting it here since folks in the chem forum are probably already tired of all the threads relating to problematic magnesium testing. I'm going to propose a method, let's call it the Randy Magnesium Method, or RMM for short. All good...

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