I used to use Salifert's potassium testing kit and loved it because it was quick and accurate. They stopped making these specific testing kits which was very upsetting. What brands is everyone trusting their tanks with?
That's not something people normally test for in reef aquariums.. I'm not surprised they stopped making it. looks like Red Sea makes one.. can't vouch for it though.. never used one in my 20 years of saltwater experience...
edit: Ahh.. I see.. if you are using a zeovit or similar system then you are supposed to test for it because it screws up your water... wonderful...
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