All I can find on the web tells me natural seawater is about 380ppm
A testing problem I have is the Elos turbidity kit has a small range between 300 and 400, so it's near impossible to tell what the results are, and this leads me to believe it's not worth dosing as maybe I'll add too much and upset my critters
I'm with Brad and others ... frequent WCs and ignore the K issue altogether
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