Convert PPM GH and KH to other scale
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Old 05-05-2004, 10:59 PM   #1
tommyboy22481
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I was using Jungle labs 5in1 quick dip testing strips to test my GH and KH. When I ran out of strips I bought a TetraTest water test set. The strips had GH and KH in PPM, and the TetraTest kit has them in "# Drops". How do I convert the ppm to "# Drops"? I tried searching for the formula but I just got more confused. ops:
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Old 05-05-2004, 11:00 PM   #2
amanda huggenkiss
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Doesn't the kit come with some sort of colour scale with ppm listed?

Whoops, actually I posted faster than my brain was working. You can enter the number in Chuck's calculator and it will convert the measurement from degrees (# of drops) to ppm. ops:
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Old 05-05-2004, 11:08 PM   #3
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Divide ppm by 17.8 (or 17.9, depending on the reference) to get dH.
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Old 05-05-2004, 11:51 PM   #4
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The number of drops = dKH or dKH. To convert from dKH or dGH (what you understand to be number of drops) to ppm, multiply by 17.8. To reverse just devide.

Just a side note 1ppm = 1mg/L
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Old 05-05-2004, 11:53 PM   #5
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Thanks!
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