3 x 4 lbs of PBW.  A total of 12 lbs of PBW.  PBW is my go-to homebrew cleaner.

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Five Star PBW Cleaner (Powdered Brewery Wash), 4-Pound Jar, 3 Pack

Also: Five Star PBW Cleaner 4-Pound Jar | Star San Acid, 32 oz

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