On Sat, 07 Nov 2009 17:56:59 -0600, The Daring Dufas
wrote:


The self cleaning units, if I remember correctly, have a cold
water supply tube that goes all the way to the bottom of the
tank and is curved in such a way that it swirls the water
around which keeps the sediment stirred up so it goes out with
the hot water.

There is some debate about whether or not the feature is
effective at reducing sediment.


Yes, it works. Just checked mine after 10 years.
No sediment came out of the drain.