I've been using the same distiller for probably close to 10 years and have 
never had a problem.
The other day I noticed some white particles floating on the top of the water 
in the distiller jug.  The water is very hard where I live and usually the 
inside of the pot needs to be cleaned at least once a week (I distill 1 pot a 
day).  The substance almost looks like the minerals that build up on the inside 
of the pot on the sides where it dries.  I also noticed a white powdery 
substance on the inside of the tube that the water drips out of.
Anyone have any ideas on what this could be and how I can resolve it?Thanks.PT