How to remove carbonates in the water - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 05-26-2014, 03:23 AM Thread Starter
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How to remove carbonates in the water

Is the only way to do it just by doing large water changes?
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post #2 of 13 (permalink) Old 05-26-2014, 04:24 AM
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rainwater, distilled water, reverse osmosis. Remove causes of high carbonates such as substrate.
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post #3 of 13 (permalink) Old 05-26-2014, 04:24 AM
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You can remove them, dilute them, or break them down with mild acids (ie- peat water, vinegar, etc).

The question is- why? What are you trying to accomplish?

Unless they're excessive, or unless you're trying to stimulate some softwater fish species to spawn, some carbonate hardness tends to be helpful in an aquarium to help stablize the pH. Plants can also utilize them to some extent for their carbon needs.





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post #4 of 13 (permalink) Old 05-26-2014, 05:24 AM Thread Starter
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Need to lower pH for GBRs. I posted a thread before about how I had crushed coral in my filter and it raised my pH to 7.6, so I took it out. I did several water changes to get it back down but now today when I tested it, its back up to almost when I had the coral meaning the carbonates are still in my water and that was a week ago. I don't want to keep hauling buckets of water anymore so I'm trying to find a different solution.
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post #5 of 13 (permalink) Old 05-26-2014, 01:24 PM
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I know you said in your other post the rocks did not alter the water. Could you take a picture so we can see the rocks. Also please list every non living thing in your tank. There must be some thing we are missing. Also what was your pH after a few days in that cup.

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GEOLOGY Rocks Have A Gneiss Day
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post #6 of 13 (permalink) Old 05-26-2014, 07:06 PM Thread Starter
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The cup reading is still 6.8.
I have Red Sea Flora base on the left side of my tank
Regular playsand on the right (pH stays the same with the play sand)
Drift wood (Im not sure what type but I think its spider wood)
Almond Catappa leaves X4
Rocks (some have a bit of algae on it):
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post #7 of 13 (permalink) Old 05-26-2014, 09:25 PM
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Well I see your problem some of your rocks look to be limestone and or marble.

Have a gniess day. -Scott

GEOLOGY Rocks Have A Gneiss Day
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post #8 of 13 (permalink) Old 05-26-2014, 10:40 PM Thread Starter
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Which ones? I'm guessing you think that the greyish one is marble? But it doesn't have that translucent look to it.. As for the white ones, I guess those are limestone? What about those reddish brown rocks?

Last edited by Codzilla; 05-26-2014 at 10:52 PM. Reason: didnt specify
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post #9 of 13 (permalink) Old 05-26-2014, 10:50 PM
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Not sure about pic 1 and 2 possibly sandstone.

The rock on the right in pic 3 and pic 4 appear to be lime stone. I would remove the rocks in pic 1 and 2 let the pH stabilize then add them back in one at a time while checking your pH over the course of many weeks. Or place each rock in a bucket and monitor the water peramiters in each bucket for a month.

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GEOLOGY Rocks Have A Gneiss Day
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post #10 of 13 (permalink) Old 05-26-2014, 11:48 PM Thread Starter
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I just did the vinegar test with all the rocks. None of them fizzed or bubbled. But I can confirm that the white rocks do have some translucent marble looking structures embedded in it.
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post #11 of 13 (permalink) Old 05-27-2014, 12:05 AM
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Quote:
Originally Posted by Codzilla View Post
I just did the vinegar test with all the rocks. None of them fizzed or bubbled. But I can confirm that the white rocks do have some translucent marble looking structures embedded in it.
Vinegar is a very week acid, and does not always react with carbonate rocks. I would get some HCl acid to test.

Have a gniess day. -Scott

GEOLOGY Rocks Have A Gneiss Day
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post #12 of 13 (permalink) Old 05-27-2014, 04:09 AM Thread Starter
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[QUOTE=metageologist;6041314]Well I see your problem some of your rocks look to be limestone and or marble.]


Well what do you know. It didn't even take 3 hours in the bucket and the rocks raised the pH of tap water of 6.8 to 7.2 and beyond. The rocks will now go into my turtle tank. Problem solved. Thanks.
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post #13 of 13 (permalink) Old 05-28-2014, 09:59 AM
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Your welcome.

Have a gniess day. -Scott

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