[Avodah] Kshering Metal Sinks

[Akiva Miller]

.
The Chicago CRC has a video on hag'alat keilim at
https://www.youtube.com/watch?v=21HSfRG69ho&feature=youtu.be

I am curious about two things he said at 6:52-6:59, about kashering a metal
sink:
1) "make sure that it's a continuous flow and not to stop in the middle
from that pot"
2) "start from the bottom and then you work your way up"

Why should it be a continuous flow? What's wrong with pausing the flow, as
long as every square millimeter gets hit?

And what is the advantage of doing the floor of the sink prior to the
walls? Alternatively, what's the downside of kashering the walls first? My
totally uneducated guess is that the runoff from the walls would do a
"chozer v'niur" on the floor, cancelling the 24-hour wait, whereas if the
floor is done first, the runoff from the walls is not sufficiently
chometzdik to invalidate the kashering. Am I close?

Akiva Miller
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