Quote:
Originally Posted by nereefpat
I believe OP is talking about the difference between the Hannah reading of 6.7/6.8 and the Red Sea reading of 9-10.
Since this tank is new, and there shouldn't be much alk demand, and freshly mixed saltwater should be closer to the 9-10 dKH range, I would suspect testing error with the Hannah Checker. I haven't used Hannah checkers, so I can't help further than that.
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With that regard I agree. I've seen big differences between the Red Sea and Hanna results. I never paid it much attention because both readings were within recommended parameters.
I only use the Red Sea for magnesium now since the Hanna are much simpler and faster.
Maybe there is an explanation out there for why they vary so much.