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More K+

Sorry for all these repetitive postings, but, I got to my office this
morning and looked up the mean chemical contents of world river water. Not
10s or 100s of ppm, but 2.3 ppm. So a 3 ppm/day addition of K via KNO3 is
significant if one is interested in keeping soft-water fishes.

Michael Schmidt
California State University, San Marcos
San Marcos, CA