If one was about to mix the ashes with the water and the ashes fell upon his hand or upon the side of the trough and then fell into the trough, the mixture is invalid. If they fell from the tube into the trough, the mixture is invalid. If he took the ashes from the tube and then covered it, or shut a door, the ashes remain valid but the water becomes invalid. If he put it up erect on the ground, the water becomes invalid. If in his hand, the water is valid, since it is impossible [otherwise]

One who mixes the water in a trough while a bucket was in it, even though its neck was narrow as can be, the waters in it are prepared. If there was a sponge in the trough, the water in it is invalid. What should he do? He should empty out the water until he gets to the sponge. If one touched the sponge, however much the water that washes over it, the water becomes invalid.

If he placed his hand or his foot or leaves of vegetables in such a manner as to enable the water to run into a jar, the water is invalid. If he used leaves of reeds or leaves of nuts the water is valid. This is the general rule: [water passing over] that which is susceptible to uncleanness is invalid, but [water passing over] that which is not susceptible to uncleanness is valid.

One who diverts a spring into a wine vat or into pools, the water is invalid for zavim and metzoraim. And also for the preparation of the hatat water. Because it was not drawn into a vessel.