Reference for Bava Batra 192:6

ואחרים סברי תלתא עול תרין ופלגא נפיק פש ליה כוזא וכוזא בתרי ופלגא חמרא מעליא הוא

has reference only [to the case] where three were put in and three and a half came out. [For in such a case,] the Rabbis hold the opinion [that since for the] three [that] were put in three were taken out, [only] one half is over; and one half, in six halves of water is nothing. But the others hold the opinion [that for the] three put in, [only] two and a half<span class="x" onmousemove="('comment',' A sixth of the water put in is usually lost in the lees. ');">⁵</span>

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