I just wanted to update everyone on my first summer with the stenner pump and 55 gallon barrel. I opened the pool on 4/08/17 and purchased 6 gallons of chlorine to get the pool up and going. I have a small 6 gallon container that I used for this, and I will probably used that to end the season by filling it as needed. That way I do not end up with too much chlorine at the end of the season to pump out of the 55 gallon drum. I filled the drum on 4/14/17 with 55 gallons of 12% chlorine. The stenner pump and barrel are under my house so it stays cool and dark. My pool has been opened for 18 weeks (126 days) and I have about 1 gallon left in the drum. Pool typically uses 0.5 gallons per day. In the beginning I was only using 0.25 gallons per day and thru out the summer I have had to add a little more here and there to adjust for the really hot days that caused it to use more chlorine. I am really happy with the results and the chlorine not degrading too much. Going by last year when I closed the pool up in the middle of Oct, I still have about 9 weeks (56 days) left in the season. So I will probably use another 25 gallons of chlorine, or less due to the drop in temps over the next two months. I guess I will be filling the 6 gallon container with one gallon jugs as the company that I bought from only sales in 55 gallons barrels. Maybe next season I can find someone that wants to stock up about 25 gallons and I can split a barrel with them and then buy the additional 55 gallons for myself in the middle of the season. Whats sad is I will pay almost as much for the single 30 gallon jugs as I did for the 55 gallon barrel. Oh well, its still a lot cheaper and better than all the junk the pool stores try to push on you!