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Reverse osmosis filtration, addition of distilled water, or destruction of buffering with a strong acid will all reduce KH.

Basically there is no easy way to lower KH. It's very easy to raise KH. You have an almost zero percent chance of keeping Erio's or Tonina's alive in water with a KH of 11. Tonina sp. 'Belem' is probably the easiest of the Toninas to keep happy.
 
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