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Percolation Recipe Structure

P 2.05 – Glossary and Recap

Recap and Glossary


  • Percolation brew strengths are most often stronger than 1% strength and usually weaker than 2%.
  • To enter this range using one litre of brew water, the lowest dose of coffee you would need would be around 50 grams, and the highest would be around 70 grams.
  • In hand-brewing, a filter basket is usually labelled ‘01’, ‘02’, or ‘03’ which pertains to the number of cups it is recommended to produce.
  • The flat-bed filter is designed to prevent the bed of coffee from getting too thick and so for large scale brews over 1L, it is recommended to switch to a flat-bed brewer.
  • The tendency in specialty coffee brewbars is for the required accuracy to be within 0.2 grams of the specified dose.
  • Conducting two simple calibration tests will help ensure your batch brewing machine is dispensing the correct amount of brew water.
  • There are three principal phases when planning for a percolation brew method: blooming, dilution, and drawdown.
  • We recommend a minimum of 6 pulses for batch-brewing.
  • The holes in the filter paper are very small, approximately 20 um in diameter.
  • Fines migration can lead to the holes becoming blocked in a process known as muddying.



Beverage Weight  The combined weight of water and dissolved coffee solids excluding the weight of the cup.

Blooming  The practice of pre-infusing coffee grinds at the start of the brewing cycle. It takes its name from how the coffee grinds appear to expand like a flower opening up.

Brew-water  The total amount of water dispensed into the slurry during brewing.

Contact time  The amount of time between the first contact water makes with the coffee and the moment the brewing process is arrested e.g. by the separation of the decanter and the filter cone.

Delivery time  The total amount of time it takes for brew water to be added to the slurry.