Thought I would share my tested co2 system. this setup lasts me 3 weeks.
2 cups sugar
1 tablespoon baker yeast
2 tablespoons malasses to have it last longer
2 liter bottle, NLS 1mm pellet bottle, 2 backflow preventers, In tank filter, some silicone, & airline.
Tools used, Drill with 1/4" bit sissors.
the tank side view
just make sure to check your PH reg. as it will drop adding co2 if you have fish in the tank. I ran it for 3 hours then removed it for 2hours then repeated til the ph stayed the same. Mine dropped from 7.4 to 7-6.9 (color really hard to tell) over the course of the day I put it on. Its now stable.