Lol Spanglish Matt you Kill me lol. But if you go to Natwell give it to the older guy by the name of Joe. When you fill the tank there you do open the valve to empty the bottle since you fill the bottle by weight. Once it is empty then they put it on the scale with the filler hose on and zero out the scale then fill till just about the size of the bottle will hold. Say a 5 pound or 10pound or 20pound. Now the 5 pound bottles are a little more tricky because they weight so little. I would stick with atleast a 10pounder. In the summer they or should put a little less CO2 in the tank to compensate for expansion for the higher temps. You aught to see a 800pound CO2 tank pop a valve lol. If you have questions like these I would be glad to answere them. I used to work there and the only people you can trust as to know what they are doing is Joe and Isac. I was the Nitrogen Man lol. I handled those Big White tanks next to telephone poles you see now and then. Try moving a tank of 600 to 800 pounds by hand . But since I left now they deliver the tanks empty and go by with a trailor and fill them.