The CLT is a stainless steel water tank with cooling jackets or an external heat exchanger. The CLT is filled with water that is chilled between brewing cycles to a temperature around 35 F. This cold water is then pumped through the wort exchanger at a 1:1 ratio, cooling the wort from post boil temperature to the desired fermentation temperature. The exiting water, (now 140-160 F) is transferred to the hot liquor tank to be utilized for the next batch of beer. The CLT is often sized to hold enough cold water to service a typical 24-hour brewing cycle.