I dont use a counter on my DIY setup. I will be maiking one soon. I use a 1G container. It was easy and has a wide stable base. I know when I renew the bottle it bubble like crazy I havent counted but I can see the mist flowing. After a couple of days it cuts back. I know I get atleast 1 BPS for the last of 2 weeks. I will be adding a 2nd bottle this weekend then Just alternate the weeks that I change them I will have more constant CO2 Levels. Also the warmer you can keep the bottle the more CO2 it will prodice. When I get my Canopy Done both bottle will sit on it for heat.