DIY reactor & metal leeching concerns - The Planted Tank Forum
 
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post #1 of 14 (permalink) Old 10-25-2004, 05:52 AM Thread Starter
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DIY reactor & metal leeching concerns

The reactor for my 10gal was finished today, and I installed the brass hose fittings. Is brass OK to use here? I'm thinking about adding red cherry shrimp to the tank and was concerned about copper leeching into the water.
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post #2 of 14 (permalink) Old 10-25-2004, 06:09 AM
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Stay away from brass. First DIY setup I made used brass and it corroded in a week.
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post #3 of 14 (permalink) Old 10-25-2004, 10:22 PM
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Brass is fine to use with your CO2 setup. I use brass barbs on all of my CO2 setups, both High Pressure CO2 and DIY 2L Bottle setups. I am not sure what this person is referring to when he states his brass end fittings corroded.

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post #4 of 14 (permalink) Old 10-25-2004, 10:53 PM
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Corroded. Turned green and metal wore away. If it comes in contact with yeast water or really any of the "fumes" it seems to corrode. That's what happened to mine.

I use plastic pieces now for all CO2 connections and it works flawlessly. No copper concerns.
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post #5 of 14 (permalink) Old 10-25-2004, 11:21 PM
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Remember what CO2+H2O is! Thats right kids. Carbonic Acid. It makes things melt!

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Remember we dont keep fish or plants, we keep the water they live in......

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post #6 of 14 (permalink) Old 11-13-2004, 10:37 PM
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Any other ppl had problem with brass corroding?
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post #7 of 14 (permalink) Old 11-14-2004, 02:24 AM
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Yes, and just like Rolo described. It didn't corode like iron. It did turn green.
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post #8 of 14 (permalink) Old 11-14-2004, 04:54 AM
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copper oxydation?
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post #9 of 14 (permalink) Old 11-14-2004, 06:10 AM
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I don't know if it would be copper oxidation, but due to carbonic acid the green film produced is a basic copper carbonate - CuCO3·Cu(OH)2. Or otherwise called virdigris? Anyone feel free to confirm this.

Apparently too this coating is to protect copper from further corrosion, but I'm sure in the process some copper is leached into the water. Our cities tap is very high in CO2 (30-40ppm). Go to any new building with fresh copper pipes and you'll see a thick green coating on all the foutains. Water taste like pennies too. The copper had to get there somehow and it had to be through the water.

That's why I would play it safe and stay away from brass.
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post #10 of 14 (permalink) Old 11-14-2004, 06:21 AM
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Still confuses me though why I would find something like this:

Quote:
Originally Posted by quote
Carbon Dioxide and Brass
The following is quoted from Page 1004 of Volume 1 of the ASM Metals Handbook Eighth Edition (3).

All copper alloys are deemed to be “suitable under most conditions of use with dry carbon dioxide, moist carbon dioxide and carbonated beverages”.
But do a google and you get copper + carbonic acid = corrosion. That quote came from the Luxfer CO2 cylinder site, and I would bet "suitable" tolerates conditions where some copper leeches into the water supply, as it does here. My guess, CO2 reactors and aquariums must not be under "most conditions" since it only takes traces of copper to kill.
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post #11 of 14 (permalink) Old 11-14-2004, 06:36 AM
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You also have to look at the quantity. We are not talking pipes here, just a single fitting. Most of the time that single fitting, even coroded, woudl not do any harm. Now if this were aquarium plumbing, well.........

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post #12 of 14 (permalink) Old 11-15-2004, 12:26 PM
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Quote:
Originally Posted by enchanted
You also have to look at the quantity. We are not talking pipes here, just a single fitting. Most of the time that single fitting, even coroded, woudl not do any harm. Now if this were aquarium plumbing, well.........
That is a valid point.

Then its probably just me being overly cautious when it comes to copper. Already two full batches of shrimp have died on me and it has been due to copper. Just trying to be safe now and eliminate all possible sources that I can control.
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post #13 of 14 (permalink) Old 02-04-2005, 12:27 AM
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i used brass fittings once for a computer water cooling effort
it goes green but it doesent exactly corrode...

and thats only if the brass gets damp/wet/submersed
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post #14 of 14 (permalink) Old 02-04-2005, 01:35 AM
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not the only concern

Not only is copper a concern but the third ingredient in in brass is lead yes your everyday toxic lead. Lead can leach into your tank water where it will harm your fish and you if dip your hand s in the tank alot. There is no such thing as a safe amount of lead to be tainted with.
That is why so many modern faucets are advertized as stainless lined etc interiors. There was a scandel about under the counter water filters where the tap the filters came with were leaching many times the amount of lead the filter was removing. The good new ones have a non metallic lining that solves that problem.
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