How Coffee Percolators Work

Fill the urn with water as to how many cups of coffee is required. Add the percolator coffee grounds basket with the desired amount of coffee (one tablespoon per cup), then fit the basket onto the urn and place on the stove top. Heat the water to boiling. The boiling water will be forced up through the coffee grounds and the brewed coffee will accumulate in the urn. Watch the coffee bubbles up through the glass cover to measure how dark (strong) it's getting. Brewing should take for about 5 minutes. Remove the filter basket with the used grounds and pour it out.
           
The basic principle behind the Coffee Percolators is based on the formation of  the air bubbles formed in boiling water at the bottom of the pot and their natural rising  action. The base of the Pump Stem tube is designed to concentrate this flow of bubbles toward the tube opening.

The diameter of the tube is smaller than those of the bubbles, so that each snugly-fitting bubble that passes through the tube will carry a bit of water above along with its upward journey.
 
As these continuous jets of water reach the top of the Pump Stem, they discharge on the Spreader Cover, which  then helps disperse the water over the grounds underneath in a more uniform manner, and also keeps grounds from splashing up.
           
Continuously, the infusion will boil upwards and filter through the grounds back down into the pot. Every time the  water filters through the grounds, it moves more of the oils into the infusion, making it stronger. The longer the water percolates over the coffee grounds, the stronger the coffee brew becomes. And the lesser times the water percolates over the coffee grounds, the weaker the coffee brew becomes.
 
With practice you will learn how much coffee, how long to brew and percolate, etc.
Experiment until you find the optimal taste for you.

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