Larry Spaketh Thusly:

your thoughts
There's a zillion posts on this if you google groups search this group, or
just google "DIY CO2". Go back as far as you want, the principles and
materials haven't changed.

Quick hits: http://www.thekrib.com/Plants/CO2/co2-narten.html (follow the
links) and
http://www.qsl.net/w2wdx/aquaria/diyco2.html (good illustrations)

FWIW: I use large juice bottles instead of soda bottles, they are a bit
sturdier. I put my setup together in 30 mins for about $4 (both silicone and
stiff tubing) and haven't touched it except for refills & cleaning in over 3
years.
I use 2 juice bottles and alternate filling them each weekend, since they die
out after about 10 days using plain bread yeast from the supermarket.
A hot glue gun is great for sealing everything up if you have one of the large
very hot commercial type ones. The little craft ones don't seem to cut it.

My homemade reactor - plumbed to the output of my Magnum - cost less than $10,
but I went a bit fancy on that - it even has a cleanout plug :-) 2" PVC
tubing and joints, with cheapo plastic bioballs for turbulence. The CO2 input
it a plastic check valve solvent-welded into a hole drilled into the pipe - I
thought that was a weak spot but it's still holding up perfectly so I never
redid it.


--
Bill H. [my "reply to" address is real]
www.necka.net
Molon Labe!