ATCP 65.28(2)(a)1.1. Stainless steel of the American Iron and Steel Institute 300 series, or an equally corrosion resistant metal. ATCP 65.28(2)(a)3.3. Plastic, rubber, or rubber-like materials that are fat resistant and insoluble; that are resistant to scratching, scoring, decomposition, crazing, chipping, and distortion under normal use conditions; that do not impart chemicals, flavor, or odor to milk; and that maintain their original properties under conditions of repeated use. ATCP 65.28(2)(b)(b) Product contact surfaces shall be easily cleanable and shall be free of breaks, open seams, cracks, or similar defects. Product contact surfaces shall not impart any odor, color, taste, or adulterating substance to food. Product contact surfaces, other than product contact surfaces of approved C-I-P systems, shall be readily accessible for manual cleaning. Joints and fittings shall be of sanitary design and construction. ATCP 65.28(3)(3) Location and installation of dairy processing equipment. ATCP 65.28(3)(a)(a) Dairy processing equipment shall be located and installed to prevent overcrowding and to prevent contamination of dairy products or product contact surfaces by splash, condensation, or manual contact. ATCP 65.28(3)(b)(b) Dairy processing equipment that cannot be easily moved shall be installed in a manner that prevents liquid or debris from accumulating under or around the equipment. ATCP 65.28(3)(c)(c) Dairy processing equipment shall be installed so that there is adequate clearance on all sides for cleaning and maintenance. This does not apply to that portion of a tank or container that is designed to protrude into or through a wall or the ceiling of a dairy plant. ATCP 65.28(4)(4) Bulk storage tanks; venting. A tank used for the bulk storage of milk, whey, or liquid food products shall be equipped with an air filter to prevent contamination of tank contents, or shall be vented only to one of the following: ATCP 65.28(4)(b)(b) A tank gallery room that complies with processing area sanitation standards under this chapter. ATCP 65.28(5)(a)(a) Every storage tank, freezer, and cold storage compartment used to hold milk or dairy products shall be equipped with a thermometer or other device that accurately indicates the temperature in the storage tank, freezer, or compartment. ATCP 65.28(5)(b)(b) Each of the following bulk storage tanks shall be equipped with a 7-day temperature recording device that shows the temperature of dairy products stored in that bulk storage tank: ATCP 65.28(5)(b)1.1. Every bulk storage tank used to store grade A milk or grade A dairy products for longer than 24 hours. ATCP 65.28(5)(c)(c) Instruments and controls used for measuring, regulating, and recording temperature, pH, acidity, water activity, or other conditions that control or prevent the growth of undesirable microorganisms in milk or dairy products shall be accurate, fully functional, and adequate for their intended use. ATCP 65.28(6)(6) Lubrication. Equipment shall be designed and constructed so that gear and bearing lubricants do not come in contact with milk or dairy products, ingredients, or product contact surfaces. Food grade lubricants shall be used if there is any chance that lubricants may come in contact with milk or dairy products, ingredients or product contact surfaces. ATCP 65.28(7)(a)(a) A dairy plant operator shall clean and sanitize product contact surfaces of equipment and utensils to keep them at all times in sanitary condition. Sanitizing methods shall comply with s. ATCP 65.34. ATCP 65.28(7)(b)(b) Except as provided in pars. (c) to (f), a dairy plant operator shall at a minimum clean all product contact surfaces of equipment and utensils after each day’s use, sanitize those surfaces before each day’s use, and clean and sanitize those surfaces before any change in use that may cross-contaminate dairy products with major food allergens, as defined in s. ATCP 70.02 (29), or other contaminants. ATCP 65.28(7)(c)(c) A dairy plant operator shall clean and sanitize tanks used to store liquid dairy products whenever the dairy plant operator empties those tanks. Tanks used to store raw milk or grade A dairy products shall be emptied at least once every 72 hours. ATCP 65.28(7)(d)(d) A dairy plant operator shall clean evaporators at the end of a continuous operation, not to exceed 44 hours. ATCP 65.28(7)(e)(e) Paragraph (b) does not apply to any of the following equipment, provided that the dairy plant operator cleans and sanitizes the equipment according to manufacturer specifications or a cleaning and sanitizing process approved under par. (f), and complying with par. (a): ATCP 65.28(7)(e)4.4. Equipment used in brining, aging, curing, and dry product blending processes. ATCP 65.28(7)(e)5.5. Reverse osmosis equipment that utilizes a permeate stream from a previously pasteurized product that has passed through a nanofiltration system achieving an efficiency of not more than 1,000 daltons.