[trenac]

Here is the link that I used for my first DIY C02...
http://www.thekrib.com/Plants/CO2/

And here is the one I used to make my DIY pressurized system...
http://sammyxp.tripod.com/html/id23.html

 

[trenac]

I put my DIY pressurized system together for $130 total, not bad.

I have a 5lb bottle on a 55G tank. I have not had the tank hooked up long enough yet to see how often I will have to fill it. From others I have heard a fill up should last anywhere between 6-12 months depending on your aquarium size & bubble count.

I found in my area that welding shops only have used canisters (which you have to swap for another) and industrail grade C02. So I went to a store in my area that supplys resturants with C02, there I got a new canister that I can have refilled & food grade C02 which is cleaner (less oil) than industrail grade. Just something to think about.

Also instead of using a spice jar for a bubble counter I use a Hagan Ladder (diffuser/bubble counter) that you can get from Big Als for $10.

 

[trenac]

Did you happen to check out home brewing supply stores for Co2 cannisters. I imagine they would be about the same price and grade as the food supply stores.

The reason I ask is because there is one right down the street from my house.

I did... The ones in my area did not carry them, however it may differant in your area. I want hurt to check.