A cleaning apparatus for cleaning and sanitizing a tank, the tank for holding liquid food grade product, the liquid food grade product being transferred into and out of the tank by means of vacuum, the tank having a vacuum transfer system for transferring liquid food grade product includes apparatus...http://www.google.com.au/patents/US6058949?utm_source=gb-gplus-sharePatent US6058949 - Vacuum transfer system and method for food grade product
