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[APD] Total Dissolved Solids vs General Hardness

Hi Everyone,
I am receiving an order of Discus in a couple days. I have kept and even
bred these fish in the past, but it has been a few years, and the business I
am getting these from uses a Total Dissolved Solids (TDS) parameter they
like to keep their water within. I'm getting a TDS meter for the fish, but
was wondering if TDS and GH are the same thing or different?

Any help is appreciated.

David Grim

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