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how much potassium to add to get 10ppm

Andy Moore asks:
> How much eg.Potassium would you add to say 10 gallons of RO or fully
> de-ionised water to obtain a reading of 10ppm.

If it's potassium sulphate, 1/8 tsp per ten gallons of water without any
potassium will give you approximately 10ppm. If it's a different
potassium compound, it depends upon the ratio of potassium to the other
elements in the compound and the density of the compound (how much a tsp