I doubt that the DIY CO2 would generate enough pressure - depending on your set up of course. The 'pop' bottles I used to use would always give out first, usually the lids. In the end I used to feed my CO2 directly into my intake pipe of my Eheim filter (which I still do now with my pressurised set-up). That way the CO2 would stay in the water for a long time and also get smashed up by the impeller. I always managed high levels of CO2 and don't forget the 'marmite' when making your own mixtures - it increases the CO2 yield and length five-fold.