The Gemoro discusses drinking from a multi-spouted vessel at the same time - only permitted if the Jew stops drinking first, since when the non-Jew stops sucking some remnants flow back into the vessel (if I have understood correctly). My question is, what about the next time a Jew wants to drink - will he not get the remnants? In other words, how could the Jew start drinking in the first place - there will be remnants from the previous non-Jew!

Kol Tuv Mark Bergman Manchester, UK