Water in tubing for Co2 injection system

**popimac** · 23rd Apr 2016, 17:08

Anyone has the same situation? And how to prevent this? I am using a bubble counter and a one way valve.

TIA!

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**Frozenicex** · 23rd Apr 2016, 17:30

Using a stop valve should solve this problem.

**popimac** · 23rd Apr 2016, 20:44

I'm already using. The one way valve I mentioned is the check valve.

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**Urban Aquaria** · 23rd Apr 2016, 22:29

That's the best you can do... just position the check valve closer to the diffuser or atomizer if you want to further limit the back flow.

At most when the parts of tubing that get filled with aquarium water start to turn brown due to algae and mulm, just cut it away and replace that short length of tubing with a new tube.

**popimac** · 24th Apr 2016, 08:53

Thanks UA. My check valve is indeed near the bubble counter and the solenoid. Will try to shift it closer to the diffuser. Is such situation common? Sorry for the ignorance, first time user.

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**Urban Aquaria** · 24th Apr 2016, 16:34

Yeah, its normal for aquarium water to back flow into the Co2 tubing when the solenoid is off. It doesn't affect anything though, just makes the tubing abit dirty after a while, have to eventually clean it or just replace with new tubing.

You do need to make sure there is at least one level of check valve between the diffuser/atomizer/reactor and the regulator though (usually its the bubble counter's own inbuilt check valve or a separate check valve), so that aquarium water doesn't back flow all the way into the regulator itself.