Premixed soft drink

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Also know as a premix.

[edit] History

In the 1960's, soda fountains were refilled similarly to the way propane stations are filled. A fully carbonated ready to drink batch of soda know as a premix was transferred into large tanks and distributed under pressure.

[edit] Carbonation tester

This Premixed Soft drink Carbonation Tester is constructed of tempered glass and stainless steel with a quick connect on the bottom, and a 100 psi gauge and a relief valve on the top. Used in the 1960s to check the pressure of premixed soft drinks before shipping them off in 5 gallon tanks by truck, it is operated by connecting the tank to the quick connect, bleeding off gas to allow the glass to fill and then shaking it up. The pressure is then read from the gauge.
This Premixed Soft drink Carbonation Tester is constructed of tempered glass and stainless steel with a quick connect on the bottom, and a 100 psi gauge and a relief valve on the top. Used in the 1960s to check the pressure of premixed soft drinks before shipping them off in 5 gallon tanks by truck, it is operated by connecting the tank to the quick connect, bleeding off gas to allow the glass to fill and then shaking it up. The pressure is then read from the gauge.

At the soda plant, a quality control manager would periodically check the carbonation level on one or more of the 5 gallon pressurized tanks before they were sent out by truck to refill a soda fountain. An antique manual soda tester from that era is shown here.