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I did this system and on my 10g tank here's the video of it running.

Used two 2liter bottles and one 20oz bottle as the nasty stuff stop.

Check valves between 2 liter bottles and 20oz and a check valve between the 20oz and the airstone.


I'm thinking it may raise my CO2 a little high due to the amount that it's bubbling.


Rather straight forward.
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