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http://www.qsl.net/w2wdx/aquaria/diyco2.html

A very informative website about CO2 for plant nutrition. How to make a DIY CO2 unit, and how to properly diffuse it into the water.

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DIY CO2 production: I use this myself, but I use another smaller 'filter' bottle with water where the CO2 needs to go through. Is also a bubble counter!

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