Richard

Cartridge claims to flavor 6-20 ounce bottles of water. I figure the more flavor the fewer bottles it will successfully flavor. I decided to try a lower number 3 out of 9 to max the usage. Barely there flavor but I am trying to get 6 bottles. No such luck. After one and a half 16.9 ounce bottles of water there is no flavor left. Do not waste your money or time with Cirkul. Good idea, poor design no insulation to keep the water cold. Cartridge duration a joke. Stay away!