How To Make Co2 Like The Nutrafin One

[Fighterfish]

Hi,
Was just wondering whether anyone could give me insturctions on building a Co2 thingy like the nutrafin one. Thanks in advance.
SF

 

[saboy]

Here is a link on how to make one http/www.fishforever.co.uk/carbondioxide.html


I got if from searching on google "diy co2"

 

[greeneyes]

here is a link which gives few more ideas: http/www.qsl.net/w2wdx/aquaria/diyco2.html