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I may have been one of the people who asked about using water softner water as most use salt to soften the water. Potasium is an alkaline and comes from pot ash
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Please be careful with your posts.

Potassium is an essential element for biological health and cell function. All water softeners use "Salt" (<- the reference is NaCl or KCl, potassium chloride or sodium chloride, both mineral SALTS) Sodium (Na) is also essential for cell function and biological function. Both mineral salts are need for healthy fish...BUT only require trace <- read that very very small amounts.
Rusty Nut is dead on...and the technique he describes is the essence of simplicity.
Regards,
Jay