Soda+Siphon

The compressor compresses the HCFC gas which sends it to the coils which dissipates and condenses to liquid form. This high pressure HCFC flows through the expansion valve which vaporizes the liquid HCFC and drops the temperature. The lowered temperature acts as a refrigerant and the cold HCFC is sucked up by the compressor to restart the cycle. In the soda siphon, a small needle punctures the high pressure CO2 cartridge and the expansion into the compressor cools the gas and the cartridge. This catalyzes the cooling process which keeps our fridges cold.

As early as 1790, the concept of an "aerosol" was introduced in France, with self-pressurized carbonated beverages. The modern syphon was created in 1829, when two Frenchmen patented a hollow corkscrew which could be inserted into a soda bottle and, by use of a valve, allowed a portion of the contents to be dispensed while maintaining the pressure on the inside of the bottle and preventing the remaining soda going flat.

Soda syphons were popular in the 1920s and 1930s. The rise of bottled carbonated beverages and the destruction of many of the siphon manufacturers' plants in Eastern Europe during World War II led to a decline in their popularity in the years after the war.

Commercial production and delivery of pre-filled bottles of seltzer continued in the New York City and Los Angeles USA regions into 2009. As of 2009, such delivery service continues in Argentina (nationwide), Vienna, Austria by Brauerei Ottakringer and in Toronto, Canada.

Since the head of the syphon bottle is not removed for filling and there is only a glass tube leading from the head to the bottom of the bottle, the means for filling the bottle with fresh seltzer is often a puzzle. In a seltzer plant, the bottles are first washed and then evacuated using a vacuum pump and a rubber hose slipped over the nozzle. The bottle with most of the air removed is then held upside-down under the surface of a tub of carbonated water, which is drawn into the bottle by the vacuum inside once the valve is opened. Sometimes a pump is used to force higher pressure into the bottle.