I think I'm going to invest in a ppm-o-meter for co2 at least. I'll just keep the ozonator running at full blast while the co2 is on. I left the co2 on last night, but it was already almost empty, so it only lasted 10 minutes... I'm gonna go get it filled in a little bit. It's a BITCH to lug it around, as I rented a 75 pound tank!