Някой да е правил такова нещо ?
(https://aquariumbg.com/forum/proxy.php?request=http%3A%2F%2Fwww.aquaticscape.com%2Farticles%2FCO2reactor%2Freactor_4.jpg&hash=6e405829e279ecba3307acbf1d232bfdfc761bb0)
ето и цялата статия
http://www.aquaticscape.com/articles/co2reactor.htm