Thanks for that post trenac. You may have just convinced me to go with a DIY pressurized system instead of non pressurized yeast method. The several hundered dollar amount I was seeing for other pressurized systems was not appealing to me.
How big is your tank, what size bottle do you use and how often do you have to get it refilled.
Another question, when you remove the bottle to get it refilled, do you need to be concerned about the loss of Co2 injection while your out getting it filled.
Thanks to all that are taking part in this thread. I am getting very close to adding Co2 to my tank. My plants aren't doing that good right now, to much light, ~3 watts/gallon with no Co2.
All this info is a huge help in my decision making process.