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Potassium carbonate - Potas

_Maq_ said:
I'm using solely RO+DI water (EC = 1 µS/cm) and mineralize it completely for years. I never dose any nickel and molybdenum. I don't feed any fish. In spite of that, I've never encountered deficiency of these two elements. Aside from mineral salts impurities, dust and pollen seem to be sufficient sources.
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My ro filter has a resin filter, I get 0 TDS, my tap water is 500 TDS.
 
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