Reference for Chullin 50:29

א"ר יוחנן

AND RENDERS A MIKWEH INVALID;<span class="x" onmousemove="('comment',' A mikweh (i.e., a ritual bath) must be filled with waters which flow directly from a river or a stream or with rainwater, but not with waters which have been drawn from the rlver into vessels. An admixture of three logs or more of drawn water into a mikweh which does not contain the requisite amount of water (i.e., 40 se'ah) renders the mikweh invalid for all time. But an admixture of wine into a mikweh does not render it invalid.');">¹⁵</span>

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