CO2 What are you using

Show off your home made co2 system to help give other an idea as to what they might do or take examples of to create their own.
details of room and effectiveness would be very helpful too.

.......imho, pia.
I think if your grow is big enough to have co2 be of much benefit, then it's worth the investment to do it right. Pretty inexpensive set-ups anymore: CAPS PPM4? I think does it all auto other than the day/night timer keeping it @ and above 1500ppm's or something like that.
The diy co2 things are questionable too, again, imho, bring that shit in your grow; what the yeasts and shit like that? Then how do you know it's even working??
But hey, maybe I am wrong? I went and spent the 4-600 or whatever it was a few years back and would do just the same again...it is/was worth it!
But your goals may be different too: I have to run sealed so I run a mini-split for ac/rh..... So I guess it can add up.

I do have a buddy who a few years ago used one of those bucket boost co2 thingys in a tent..... I 'll have to ask how that went, although it cuoldn't have been that great or he would have said.... I know that now he's sealed with a ppm4.

Good luck. Hopefully someone will come along with what your talking about--I know it's done a lot.....

peace
gman