>   Our house has a well with pretty hard water in it; we find stuff
>precipitating over time in the toilets, etc.  We've got one pipe that's
>a particular problem - the hot water pipe to the shower in the
>downstairs bathroom.  We don't use that shower often, but both the water
>pressure and the temperature of the water coming out seem to be falling
>off steeply over the last 5 or 6 months.

>   The pressure and temperature of the hot water in the sink in the same
>bathroom isn't anywhere near as bad.

>   Is there an easy way to tell if this is caused by mineral deposits,
>and if so where in the pipe?  It's getting to the point where we
>couldn't expect any guests to use that bathroom anymore.