Beer & Malt
Recirculation is the second step in lautering. It consists of drawing off wort from the bottom of the mash, and adding it to the top. Lauter tubs typically have slotted bottoms to assist in the filtration process. The mash itself functions much as a sand filter to capture mash debris and proteins. This step is monitored by use of a turbidimeter to measure solids in the wort liquid by their opacity.
The next step is sparging.
see also: Sparging
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