On Sat, 07 Nov 2009 15:34:52 -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.

Heh, just what I wanted to know! High tech at it's best!

I presume it works somewhat, at least sounds like it can do no harm.

Thanks.

J.