"Speedy Jim" wrote
limey wrote:

Puzzle - can anyone shed light on this?
We have no problem with the hot water in the house except in the
bathroom
furthest from the hot water heater, and then only in the tub and not
the
handbasin. Anytime hot water is turned on in the tub, the water
runs black
then finally clears. Since it is the guest bathroom, it is
something I'd
like to solve. Any thoughts, anyone?
--


limey at toad dot net

Black water usually means a rubber faucet washer deteriorating.
But it might also be caused by corrosion of a galv iron nipple
in the supply or in the tub spout connection to the faucet.

Jim

It can also be caused by a trace amount or more of sulfur (H2S gas) in
the water. The tub being used less frequently than other fixtures and
usually with the best flow rate will allow precipitation of the H2S to
cling to the inside of the tubing and then break loose from time to time
as the water is used.

Gary
Quality Water Associates