Postmix beverage dispenser with water boost

A postmix dispensing system including:

• (a) a postmix dispenser;
• (b) a water line connected to said dispenser for feeding water to said dispenser;
• (c) a water pump connected in said water line;
• (d) a carbonator tank and a carbonated water line connected between said carbonator tank and said dispenser for feeding carbonated water to said dispenser;
• (e) an air bladder water boost tank and a still water line connected between said boost tank and said dispenser for feeding still water to said dispenser;
• (f) a pressure switch for sensing the pressure of still water fed from said boost tank to said dispenser;
• (g) a carbonator level switch for sensing the level of water in said carbonator;
• (h) a three-way solenoid valve having an inlet port connected to said water line, a carbonator outlet port connected to said carbonator tank and a water boost tank outlet port connected to said water boost tank, said valve having a first position in which it is open between said pump and carbonator tank and closed between said pump and boost tank and a second position the reverse of the first position, said valve being normally in said first position;
• (i) an electrical control circuit for switching said three-way valve from its first to its second position to feed water to said boost tank when said pressure switch senses a pressure below a predetermined value and for switching said valve back to its first position the pressure sensed by said pressure switch reaches a predetermined higher pressure, and for turning on said pump when said level switch senses a predetermined low water level in said carbonator tank to feed water thereto and for turning off said pump when said level switch senses a predetermined higher level.