Coffee filters have become extremely popular in the United Kingdom in recent years, largely replacing percolators. Although they vary in design, they are fairly straightforward in the way they work.
When water is added to the cold-water compartment, it flows through a hole in the base into a silicone tube containing a non-return valve. The tube feeds water to a metal boiler tube in the metal base plate. This is similar to an iron sole plate and contains a heating element which, when switched on, quickly heats the water in the tube causing it to rise towards the outlet end of the system. The outlet is positioned over a holder containing a filter filled with ground coffee. Hot water is ejected from the tube and filters through the coffee to the jug. This continues as long as there is water in the cold-water compartment and power is supplied to the heater. Read the rest of this entry »
