The Planted Tank Forum - View Single Post - Purigen? Should I consider a reactor?
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Old 10-11-2012, 03:23 AM   #6
Monster Fish
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dGH = 8
dKH = 7

1dGH/dKH = 17.868 ppm, rounded upto 18 ppm for simplicity

GH = 144 ppm
KH = 126 ppm

GH + KH TDS = 270 ppm

Um... either your TDS meter isn't calibrated or you measured your KH and GH wrong.
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