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I realize that I've forgotten what is defined as hard water, and what is defined as soft water. Like, I understand on a theoretical level that soft water doesn't contain nearly the same amount of minerals in it that hard water does. But I'm having trouble remembering where the cutoff is. And google is not cooperating tonight. So...

What is the cutoff between soft and hard water in terms of GH/KH and TDS?

Thanks in advance!

Mostly I want this information so I can know if the stocking plans I have are still considered for "hardwater".
 
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