This 3-A Accepted Practice pertains to the sanitary aspects of equipment necessary for cross flow membrane processing of milk and milk products beginning with the inlet to the supply tank which delivers the liquid product to the membrane equipment and/or the nearest valve which delivers water for diafiltration to the membrane equipment and terminates at the connections on the membrane equipment where retentate, concentrate and/or permeate leave the membrane equipment for storage or further processing. These processes include ultrafiltration, diafiltration, microfiltration, and reverse osmosis.

In order to conform to this 3-A Accepted Practice, membrane process systems shall conform to the following material, fabrication, construction, and cleaning criteria.