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]

If the ashes floated on the water: Rabbi Meir and Rabbi Shimon rule: one may take some of them and use them in another preparation; But the sages say: with any ashes that have touched water no other mixture may be prepared from them. If he emptied out the water and some ashes were found at the bottom: Rabbi Meir and Rabbi Shimon rule: one may dry them and then use them for another preparation; But the sages rule: with any ashes that have touched water no other mixture may be prepared.

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.