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Point of information: <g>

When we talk about water hardness as it affects plants, aren't we talking about dissolved calcium and magnesium, or the GH? That is what's used for plant nutrition, with a very few exceptions.

KH refers to the carbonates in the water. It's main purpose is to buffer the PH,
although a few plants are capable of using it.

I think plants in an aquarium with a GH of 1 and a KH of 10 would be starving for mineral nutrients.

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