API GH/KH water tests. - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 2 Old 11-10-2012, 11:53 PM Thread Starter
TitanTDH's Avatar
API GH/KH water tests.

Has anyone used these before and can they fill in the blanks for me. Purely in the interest of getting to know all the water parameters and better understand what is going on in my tank i purchased the API test kits for GH and KH.

Results were

KH 3 or 50ppm (Three drops into the test tube)
GH 10 or 180ppm (Ten drops into the test tube)

Have i interpreted this correctly as i am not sure.


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post #2 of 2 Old 11-11-2012, 12:03 PM
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Your calculations are correct. Obviously I can't say if the number of drops is accurate, only you know that. But each drop is one dGH or 1 dKH respectively, and you multiply these numbers by 17.9 to obtain the corresponding ppm numbers, as you have done (rounded off).

I find the change from orange to green initially very difficult to detect, but this becomes a bit more obvious after you use the kits for a time.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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