i recently posted about wanting to double my bps. i was advised to start 2 bottles (which i will do) and it was good advice but wasnt satisfied with that. i felt sure that there was a way to get more production with a single bottle so i did some research. i was using just the regular bakers yeast with sugar and a pop bottle. i then decided to make a better generator which could take high pressure giving me the ability to attach a regulator valve to the top and give me a 3 litre volume instead of 2(used pvc and will provide instructions if anyone wants). after this was done i started playing with the yeast mix. this time i used 1 tsp wine yeast, 2 cup brown sugar, 2 tsp yeast nutrient, 1 tsp baking soda, and 2 litres of water. the effects were nearly instantaneous. after 15 mins i was up to 30 bpm!!!! NO JOKE!!!! after 24 hours i am up to almost 4 bps!! again no joke!!! i am very pleasantly surprised! so if ya want more co2 use the afore mentioned recipe and have at er!!