Phosphate Testing

[Magickiwi]

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.