I went through three Hanna colorimeter kits and found that I would get three different results with them no matter how careful and consistent my testing methods are. Now I use their results as a guideline vs an actual number. I think their testing method is pretty flawed so I'm just holding on until a more reliable test comes out. The chemical reaction they are using as the base may be spot on but it's not reliable.
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I have to go out and buy more snails for my hermit crabs.
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