Testing rocks with vinager - The Planted Tank Forum
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post #1 of 6 (permalink) Old 06-13-2008, 12:07 AM Thread Starter
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Testing rocks with vinager

Hi there,

yesterday I had my hardness tested due to an unusual ph reading and it turns out it was 900 whatever, so I did water change and will do more over the next few days. I removed the rocks and will test them with vinegar today 2 thinks what happens if they are unsuitable? and is it fool proof I mean if they don't fizz could they still be a problem?

The only other things in the tank other than flora and fauna is substrate (Dupla ground) which I believe is inert and the mopani driftwood that was soaked and boiled in our town water which is very hard. Could the driftwood be leaching that hard water?

Regards Darren
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post #2 of 6 (permalink) Old 06-13-2008, 01:36 AM
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I don't think the driftwood could be causing the hard water. The amount of water absorbed by the wood is low, and would have minimal impact. Also, wood tends to soften water, not make it harder.
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post #3 of 6 (permalink) Old 06-13-2008, 02:18 AM
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Vinegar isn't a strong enough acid. You should use muriatic acid (HCl) and scratch the surface of the rock before testing.


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post #4 of 6 (permalink) Old 06-13-2008, 08:22 AM
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also do you have any of the AP test kits

i read somewhere that you can use one of the indicators (cant remember which one) on the surface and because it is an acid it will show if it has calcium

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post #5 of 6 (permalink) Old 06-14-2008, 01:49 AM
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what kind of rocks are they
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post #6 of 6 (permalink) Old 06-14-2008, 11:41 AM Thread Starter
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thanks all, they fizzed.....now I am searching for some nice rocks that are suitable, around here we have loads of volcanic rock but need a nice rock or 3

Regards Darren
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