Chuck's Czech

Dough in with roughly 5 gallons of brewing liquor to make a thick mash of approximately 100 °F (38 °C). Let rest for about one hour. At this temperature, an enzyme called phytase will become active and slightly acidify the mash. Then use direct heat and a boiling water infusion of 2 gallon to raise the temperature to approximately 120 °F (49 °C).

This temperature is within the proteolytic conversion range. Rest for 20 minutes. Again, use direct heat and a boiling water infusion of 2 gallon, this time to raise the mash temperature to approximately 150 °F (66 °C). This temperature is within the peak beta-amylase conversion range. Rest for 20 minutes.

Repeat the infusion to raise the mash temperature to approximately160 °F (71 °C). This temperature is within the peak alpha-amylase conversion range. Rest again for 20 minutes. The next infusion brings the mash to the mash-out temperature of about 170 °F (77 °C). Start lautering.

Sparge with the remaining water while maintaining the mash-out temperature. Discontinue the sparge when the kettle gravity reaches about a gravity of roughly 1.042 (10.5 °P).