
Infusion mashing is the process of regulating mash temperature by injecting heated water from the hot liquor tank into the mash tun at specific times. When conducting a step infusion mash, differing temperatures and quantities of water are infused in the mash tun from the hot liquor tank at specific intervals or steps in the mash process to control...
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http://www.westcoastbrewer.com/Beer_Glossary_and_Brewing_Terms.php

the traditional British method of mashing, primarily used in ale brewing. It occurs at a single temperature and is carried out in a combination mash-lauter vessel called an infusion mash tun.
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https://byo.com/resources/glossary
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