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post #1 of 8 (permalink) Old 10-12-2005, 07:41 PM Thread Starter
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Trouble reading KH

I tested my KH for the first time last night and the results were inconclusive.
I use a Res Sea test kit, there is a start color and end color and I count the number of drops of KH indicator. Problem is it never gets to the end color, which is orange-ish with a hint of pink. It does get dark yellow. But I see people on the boards mentioning their KH with accuraccy to the tenths e.g 6.7. What should I use to test my KH that will give me that kind of accuracy.
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post #2 of 8 (permalink) Old 10-12-2005, 07:53 PM
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I'd suspect your reagent (drops) have gone old/bad. For how many drops you put in before giving up, what would be the KH level for that? Just making sure that your KH isn't for some reason very high.
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post #3 of 8 (permalink) Old 10-12-2005, 08:06 PM
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Quote:
Originally Posted by matthewburk
But I see people on the boards mentioning their KH with accuraccy to the tenths e.g 6.7.
well, not quite. Some times people convert from dH to ppm, or vice versa, creating decimals as an artifact of conversion. Typically KH test kits are either in incremets of 1dH(17.9ppm) or 10ppm. If you double the sample size(from 5ml to 10ml for example) in the test, then each drop counts as half the increment, increasing resolution. You can even quadruple the sample if you want. You get more resolution but use more reagent as well.

It is possible that your KH kit is too old. I once had a bad GH kit that never really changes color properly.


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post #4 of 8 (permalink) Old 10-12-2005, 08:14 PM Thread Starter
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Quote:
Originally Posted by cich
I'd suspect your reagent (drops) have gone old/bad. For how many drops you put in before giving up, what would be the KH level for that? Just making sure that your KH isn't for some reason very high.
It may be that, but I'm pretty sure its fairly new, i'll check the date when I get home. I put 30 drops before I decided it was never going to match.
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post #5 of 8 (permalink) Old 10-12-2005, 08:16 PM Thread Starter
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Quote:
Originally Posted by shalu
well, not quite. Some times people convert from dH to ppm, or vice versa, creating decimals as an artifact of conversion. Typically KH test kits are either in incremets of 1dH(17.9ppm) or 10ppm. If you double the sample size(from 5ml to 10ml for example) in the test, then each drop counts as half the increment, increasing resolution. You can even quadruple the sample if you want. You get more resolution but use more reagent as well.

It is possible that your KH kit is too old. I once had a bad GH kit that never really changes color properly.
Thanks, good explanation. Is the red sea test kit ok to use assuming it is not dated.
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post #6 of 8 (permalink) Old 10-12-2005, 08:23 PM
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Have not used this particular one, I have the Aquarium Pharmacenticals kit. But I assume it should be ok if it is fresh, you never know how long it has sit in the store.


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post #7 of 8 (permalink) Old 10-12-2005, 08:34 PM
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Quote:
Originally Posted by matthewburk
It may be that, but I'm pretty sure its fairly new, i'll check the date when I get home. I put 30 drops before I decided it was never going to match.
Yeah, first thing would be to try a new kit. Even if it's new, it still could be bad, because I once bought a Hagen phosphate kit, and it turned out to be bad. I realize though that phosphate kits are famous for going bad, but still something to think about. Hagen sent me replacements quickly, so see if Red Sea might refund your money or replace the bottle(s) as well.

Plants are gone, but my 33gal and I are back after a long hiatus.
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post #8 of 8 (permalink) Old 10-13-2005, 03:14 PM
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I hear lots of 'bad reports' on all the Red Sea test kits. I stick to AP kits for all testing except phosphate, which I use SeaChem for.
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