Co2 not coming out of diffuser - The Planted Tank Forum
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post #1 of 9 (permalink) Old 04-29-2019, 09:06 PM Thread Starter
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Co2 not coming out of diffuser

New to co2. 10lb co2 tank, dual regulator, ceramic diffuser, co2 tubing. 33g long aquarium.

Initially when I was setting up the co2, I couldn’t get the diffuser to put anything out. Bubble counter was working fine. I put a new check valve on and that seemed to fix it (cause or correlation idk). For the last week everything was perfect.

Yesterday I decided to rescape everything and place the diffuser at the other end of the tank. I took off the air line and installed a new, longer one. Same check valve and same diffuser. Put it in the tank and nothing. I’ve since replaced lines, check valve, and even bought a new diffuser.

If I remove the diffuser and put the line in the water, the bubbles will start coming out of the line. If I put the diffuser back on, nothing. I can crank the gas up like mad and it will start to come out, but if I turn it back down to 1-2 bubbles then it will stop and I can actually see it reverse up the tube slowly.

Bad check valves? Line leaking?

Thanks for the help.
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post #2 of 9 (permalink) Old 04-29-2019, 09:38 PM
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you have to increase your working pressure to at least 30psi.
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post #3 of 9 (permalink) Old 04-29-2019, 09:41 PM Thread Starter
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Quote:
Originally Posted by milesm View Post
you have to increase your working pressure to at least 30psi.
Thanks for the reply. I have it set at exactly 30psi, how high would you recommend?
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post #4 of 9 (permalink) Old 04-29-2019, 10:01 PM
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try 35 and if not 40. just make sure you use the least amount of psi to make the diffuser function properly. if too high, probability of blowing off hoses goes up.
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post #5 of 9 (permalink) Old 04-30-2019, 01:35 AM Thread Starter
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try 35 and if not 40. just make sure you use the least amount of psi to make the diffuser function properly. if too high, probability of blowing off hoses goes up.
And what would you set the bubble counter at? I had to turn it up enough to where I can’t count them, but the clear diffuser bubbles internally about 1 per second.
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post #6 of 9 (permalink) Old 04-30-2019, 02:50 AM
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Are you 100% positive your bubble counter or hose connection is not leaking?
You can use soapy water applied, say , with a paint brush and look for growing soap bubbles.
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post #7 of 9 (permalink) Old 04-30-2019, 07:18 AM
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Are you 100% positive your bubble counter or hose connection is not leaking?
You can use soapy water applied, say , with a paint brush and look for growing soap bubbles.
agree with ovt. there's got to be a leak somewhere, probably between bubble counter and diffuser. what working pressure are you running now?
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post #8 of 9 (permalink) Old 04-30-2019, 10:24 AM
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What brand of Co2 diffuser are you using? Is this a used piece of equipment. Like others have said you may have a leak.
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post #9 of 9 (permalink) Old 05-01-2019, 03:15 AM
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Any chance you flipped the orientation on the check valve when reassembling? If working pressure is too low, it won't blow off the tubing.
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