5 to 1 concentrate (5 parts soda water to 1 part syrup). Only dispense the amount you want to mix a drink. Now you can always have fresh soda on demand. No waste (box and bag are recyclable). Made for soda fountains, but works great with SodaStream products. Each 2.5 gallon bag-in-box syrup (when mixed at recommended ratio) yields 15 gallons of soda when used with a soda dispenser.