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Discussion Starter · #1 · (Edited by Moderator)
Bought the fluval CO2 45g kit and a solenoid attached to a timer.

The problem is when the solenoid shuts off gas builds up in the tubing.

My question is can I buy another piece of equipment to solve this problem?

Or did I just waste money on the kit and have to buy another CO2 kit? I also have a hard time adjusting the controller to get the bubble every 2 to 3 seconds.






Here's the setup:

Tank + Controller + Solenoid + bubble counter + defused.

 

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i may be misunderstanding your setup. are you saying you have tubing between the co2 tank and the solenoid? if so, that's not gonna work. everything before the solenoid has to be able to handle the pressure being put out by the regulator. that's why the solenoid is typically threaded directly into the regulator.

it also looks like you might be using standard airline tubing, which isn't designed to handle much pressure at all.
 

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Discussion Starter · #3 ·


Yes! I have tubing between the CO2 tank/controller and the solenoid.

I didn't see how the controller and the solenoid could be connected directly. It's a 12V Solenoid and the regulator is the fluval 45g CO2 kit.




I guess there could be a connector piece I could buy as the only bolts included for the controller & Solenoid are for tubing.
 

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Here's the setup:

Tank + Controller + Solenoid + bubble counter + defused.
what is the output pressure of the controller? if it is too high it is the problem.

and from the picture I see you have creamy white flexible air hose, looks like silicone air hose to me.

silicone air hose are fine for low pressure water and air, but it is not for co2 or high pressure application.
 

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When the solenoid valve closes that section of tubing between regulator and solenoid is being pressurized, and as mentioned the air tubing you are using isn't designed for that. Doesn't take much pressure to balloon standard aquarium airline tubing.

Need to use a more ridgid plastic tubing that's designed to handle higher pressure. I'm unsure whether the current fittings will support that. Could swap to PE tubing with push-to-connect fittings. Looks like you could change fittings on the solenoid, but maybe not the regulator.
 
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