(a) Prepasteurized milk for Grade A use is cooled to 45°F (7°C) or less within two hours after milking; provided, that the blend temperatures of subsequent milkings shall not exceed 50°F (10°C). Prepasteurized milk for non-Grade A use is cooled to 55°F (13°C) or less within two hours after milking and received by the milk plant at 60°F (16°C) or less, except that morning milk need not be cooled if received by a milk plant, receiving station or transfer station before 10:00 a.m.
(b) Recirculated cold water which is used in plate or tubular coolers or heat exchangers is from a safe source and protected from contamination. Such water shall be tested semiannually and shall comply with the bacteriological standards cited in section 2.15 of this Part (Item 8r).
Milk shall be cooled in accordance with the following requirements: