The Planted Tank Forum - View Single Post - API GH & KH test
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post #2 of (permalink) Old 03-17-2015, 07:12 AM
nikhilsk99
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Join Date: Jun 2014
Location: Denver
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water hardness

To my understanding

1 Drop is 1dH One German degree hardness. So in your case it 5dH & 9dH resp.
In the U.S., hardness is usually measured in ppm
A German dH is 17.8 ppm.

0 - 4 dH, 0 - 70 ppm : very soft
4 - 8 dH, 70 - 140 ppm : soft
8 - 12 dH, 140 - 210 ppm : medium hard
12 - 18 dH, 210 - 320 ppm : fairly hard
18 - 30 dH, 320 - 530 ppm : hard

I have discus and my KH and GH is 7dH & 16dH resp. I use tap water. No RO water. Discus are doing great past 5 months.
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