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He recommends treating the issue at the water point of entry to the home with cation exchange resin, a type of ion exchange.

As we spent a chilly couple of hours in the fields, he kept returning to the need to maintain proper levels of cation exchange capacity.

He likes it for such technical aspects as a low carbon-to-nitrogen ratio, high mineral content and its high cation exchange capacity, which is a measure of the availability of nutrients to plants.

In the words of soil science, this functioning like a storage battery for minerals is called cation exchange capacity.