Check Valve

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Frequently Asked Questions...

What is the purpose of an aquarium check valve?

I have a 5 gallon tank with an aerator, heater, and filter. I have one betta in there and that's it. What does the check valve do? Does it reduce airflow? I hope so because I don't want my betta fighting strong currents all the time. I also have an air stone so that the air is diffused more evenly. Please help. Thanks!

Best Answer...


The answers saying that the check valve prevents water from flowing back out of the tank in a power outage are spot on. What happens is the water flowing back out of the tank causes a siphon to start. It can completely empty your tank, or at least down to the level you have your airstone diffuser.

If you want to avoid all possibility of this type of flooding, take your airpump and raise it to a shelf that is higher than the rim of your tank. Then you won't even need a check valve.

Best of luck,