Do you need a check valve? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 08-06-2020, 10:31 PM Thread Starter
Algae Grower
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Do you need a check valve?

This is my first time setting up a co2 system for an aquarium and I decided to set up a DIY system using 2L soda bottles, citric acid, and baking soda. I have all the standard supplies such as a bubble counter and diffuser, but I forgot to get a check valve. I heard that you dont need a check valve as long as your system is above the aquarium. I dont really understand the concept of back flow/siphoning as I thought that even if water were to back flow how would it get on the ground as it would be trapped in the tubing connecting the the regulator to the diffuser. Even though I dont really understand the process of back flow, I still want to be safe, so when talking about the system being above the aquarium, would the entire 2L bottles and regulator need to be above the aquarium, or just the the regulator part where the tubing is coming out of. If anyone has any of their own DIY setups with no check valves I would appreciate it if you could send me a picture to help me better understand the process.
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post #2 of 2 (permalink) Old 08-07-2020, 12:37 AM
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I've been running the same type of DIY system as you for about a month now with no check valve. My soda bottles are on the floor, so much lower than the aquarium water level and I have seen some back siphoning of water but not enough to even reach the bubble counter. Most people would suggest using a check valve for extra safety and peace of mind, but so far I haven't had a problem not using one on this DIY kit.

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