I tried one of those home test kits, but the results seemed odd to me. It showed a very heavy phosphorous content, but all other tests were unreadable (clear). I tried it 3 times and let the sample settle down over at least a week, and the results were the same.
I eventually opted for a more thorough test from a local extension, and the results differed in that it showed a calcium difficiency and an excess of sodium where everything else was more or less in the normal/acceptable range.
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