i don't feel like doing that ok, I am lazy as well as stupid. I linked my dad to the posts Primer on Pressurized CO2 and how to build a regulator posts though and it looks easy as balls to man who has 40 years of engineering experience. But I am still going to get the Hagen kit, for $30 it will get me started, but I am just wondering how I keep the PH/GH stable? I would like the PH to no lower than 7.2...GH I want to keep at 7 and KH I don't want to go any higher than 4. Will it effect TDS? It could stand to be much lower, seeing as how it's at 332 right now and I think that's what's been killing my cories because my water is otherwise pristine.