Two-Stage Cleaning Process Returns Kettle to Like New Condition From Madison Chemical

A two-stage cleaning process developed by Madison Chemical removes the complex and layered soil deposits found on craft brewery kettles, returning them to like new condition. This novel approach removes the hard water deposits and scale as well as embedded inorganic deposits which accumulate on kettles and heat exchangers during wort boiling and cooling. It was developed by Madison Technical Sales Representative and longtime brewery veteran Steve Gerloff and Madison Chemists, specifically to address kettle cleaning without manual scrubbing. This unique two-step treatment is ideal for kettles using steam jackets or open flames in craft brewers of all sizes and volumes.

 In stage one, MadBrew® Stone Acid is introduced to the tank to dissolve the crystalline structure of inorganic deposits produced during the wort boiling procedure through a thermodynamic reaction. This is followed by a rinse step before the introduction of MadBrew® Caustic LF + MadBrew® OX II, a specialty formulated alkaline designed specifically for hot side brewery cleaning applications. The combination of MadBrew® Stone Acid and MadBrew Caustic LF + MadBrew® OX II effectively removes inorganic deposits, scale, baked on wort/extract, and lipids from hops. Heat exchanger efficiency is also improved as similar deposits are removed.

To help brewers determine appropriate chemical concentrations, MadBrew® Stone Acid has a color indicator built in. At around a pH of 4.6 the solution will change from its original purple to yellow. This provides a visual reference that the solution is beginning to lose its ability to dissolve the inorganic deposits. After about 20 minutes of cleaning, brewers can turn off the pump to look inside the kettle. If the solution has changed to yellow but visual deposits remain, the concentration was insufficient, and should be increased. If, however, it remains purple and all inorganic deposits are removed, the concentration can be lowered, as too much chemical was used initially. Final concentrations, which are determined by trial and error, will be unique to each brewery.

Cleaning times are comparable to single-step processes, but results are achieved without scrubbing, allowing employees to engage in other activities. Customers using this process have reported improved run off times. 

To address the unique needs of craft brewers, Madison Chemical has formulated a full line of products including CIP acid cleaners, foaming acid cleaners, CIP alkaline cleaners, powdered alkaline cleaners, foaming chlorinated alkaline cleaners, and more. For more information on MadBrew® cleaning and sanitation chemicals visit

Madison Chemical is a chemical formulator which provides cleaning, sanitation, maintenance and surface preparation products for the craft brewery, pulp & paper, metalworking, food processing, industrial maintenance, transportation, wastewater treatment, winery, and other industries.  Since 1947 they have served customers worldwide from their Madison, IN headquarters and through a nationwide network of direct technical sales representatives.  For additional information visit, write to them at Madison Chemical, 3141 Clifty Drive, Madison, IN, 47250, or call (812) 273-6000 or email [email protected].

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