Co2 DIY check valve with filter - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 01-26-2011, 07:19 PM Thread Starter
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Co2 DIY check valve with filter

Just wondering if a check valve with a little air filter on it would work just as well as any other. Unfortunately this is the only one the LFS had, but I just wanted to make sure before using it later.
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post #2 of 6 (permalink) Old 01-26-2011, 08:29 PM
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If the check valve is made of plastic, with or without the filter, it will have a limited life as a CO2 check valve. Plastic and CO2 don't seem to be compatible for long term use.

Hoppy
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post #3 of 6 (permalink) Old 01-27-2011, 12:07 AM Thread Starter
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Originally Posted by Hoppy View Post
If the check valve is made of plastic, with or without the filter, it will have a limited life as a CO2 check valve. Plastic and CO2 don't seem to be compatible for long term use.
I'll probably just use it for this one bottle and then ditch it afterwards then. Also, people on here said regular airline hose is fine for DIY Co2 projects, however you need a different type for fancy, pressurized kits?

Thanks, Hoppy!
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post #4 of 6 (permalink) Old 01-27-2011, 01:35 AM
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Originally Posted by TRD_Power View Post
I'll probably just use it for this one bottle and then ditch it afterwards then. Also, people on here said regular airline hose is fine for DIY Co2 projects, however you need a different type for fancy, pressurized kits?

Thanks, Hoppy!
2 or 3 years ago, maybe less, I did some testing with cheap silicone air tubing from PetSmart. I hooked up pressurized CO2 to a 25 foot long coil of the air tubing, submerged it in a bucket of water, and never once saw any CO2 bubbles. I had a bubble counter in the circuit, and no bubbles appeared. I bled off the air in the hose, to be sure it contained CO2, and still no bubbles. I used pressures up to about 25 psi. So, I'm convinced that the loss of CO2 from silicone tubing is vastly over stated.

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post #5 of 6 (permalink) Old 01-27-2011, 05:00 AM
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Normal silicone tubing is fine. People will often say that silicone is thousands of times more permeable to CO2 than CO2 proof tubing, but the fact is that the permeation rate is on the order of 10^-6 or so...

Anthony


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post #6 of 6 (permalink) Old 01-27-2011, 03:30 PM
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When I tested silicone tubing I was looking for a way to use a roll of tubing as a CO2 diffuser. I hoped to be able to diffuse at least 2-3 bubbles per second through a 25 foot roll. It was a huge disappointment to find that I couldn't even get one bubble per minute through it. Only then did I realize the meaning of what Anthony noted.

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