GH & KH Test results. - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 11-02-2012, 11:25 AM Thread Starter
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GH & KH Test results.


Just done tests for gh and kh and had the following results.

kh 9 drops = 161ppm
gh 24 drops = 400ppm+

Suggestions please as I'm not happy wth the GH result.
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post #2 of 4 Old 11-02-2012, 04:47 PM
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Have you thought about Rift Valley cichlids or livebearers?

In all seriousness that's very hard water. Even with a 50% RO mix it will still be on the hard side. What kind of fish had you planned to keep?


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post #3 of 4 Old 11-02-2012, 08:28 PM
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Well, a 50% mix would get you down to 12 dGH but that would still be a little on the hard side.

Your hard water is good for live bearers and african cichlids as mentioned.

If a large tank doing an RO mixture will be costly unless you get a lot of rainfall reliably. So you may want to stick with hard water fish.

You can do higher than a 50% mix but that increases the cost.
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post #4 of 4 Old 11-03-2012, 07:48 PM
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Agree with others. But a question: was this the tank water or the tap water you tested? If the tap, you can verify this with the water supply board just to ensure the numbers are accurate. If it was the tank, is this different from the tap? I ask because any calcareous substances in the tank would raise the GH and KH. It is the source water (tap) that is important as the GH and KH will usually not alter significantly in the tank unless they are being targeted by something.


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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