Richard,
Thank you for the feedback.
As I said, my unit is only 1 year old. I noticed in the posts you referenced that may of the problems occurred during the 2nd year. I may be in for problems this year...
While I also have had a buildup of the "white stuff", when I started up my pool a few weeks ago, I thought that this might be calcium build up from hard water, so I put the valves in a mild solution of CLR cleaner and then brushed them with a nylon brush. So far, so good. I will keep an eye on the flow. Oddly, the flow meter is completely clear. The acrylic must resist this build up better then the material that the valves and tubing are made from.
Perhaps a SWG will be in my future.
Mario