Parah 5:7-8

Parah 5:7

One may not collect, mix or sprinkle the water from a trough in a stone, nor does it require a tight-fitting lid (to protect its contents from impurity) or render a mikvah unfit (via drawn water). If it was originally a vessel and one subsequently attached it to the ground with lime, it is permitted to collect, mix and sprinkle from it, plus it requires a tight-fitting lid and renders a mikvah unfit. If there was a hole in the bottom of it that was plugged with a rag, the water in it is unfit for use with the ashes because it isn’t completely enclosed by the vessel. If the hole was in the side and plugged with a rag, the water in it remains fit since it is completely enclosed by the vessel. If they made a rim of clay for the vessel and the water reached it, it is unfit, but if it was so strongly affixed that moving it by the rim would move the vessel with it, then the water is fit.

Parah 5:8

If there were two troughs in the same stone and they mixed the sanctification water in one of them, the water in the other trough is not sanctified. If there was a hole between the troughs the size of a waterskin’s spout, or if the water overflowed between them even if only the thickness of a garlic skin, then if the sanctification water was mixed in one of them, the water in the other trough is also sanctified.