The Planted Tank Forum - View Single Post - Do you need a check valve?
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post #2 of (permalink) Old 08-07-2020, 12:37 AM
Algae Grower
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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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