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[APD] KH kit

I recently measured my KH with both a Hagen Nutrafin kit & an Interpet kit.

The results (all with respect to CaCO3) were 150ppm (so 8.4 degrees, if the conversion factor is 0.056) with the Hagen kit & 4 degrees with the Interpet kit.

This is a massive difference - especially as I'm using it to check my CO2 level!

Is there any easy way to make a KH "reference" solution so I can work out which is correct?

(I think it's the 4 degrees - otherwise all my fish should be dead!)

Regards, Kevin
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