John, It almost sounds like you service only one water tank that *doesn't* have the SHB. I think you can't make an accurate comparison that way. It is possible that the buildup you mention has more to do with the water than the sensor wires. If you had at least six or so of each, and noticed that on every SHB there is lots of buildup and every plain bar had little or none, then you have more of a basis for reaching an accurate conclusion. I don't know about the water in your state, but in this county the mineral content can vary a lot. You want to be sure you don't blame the SHB if the real culprit is the water. I have a couple clients who use only distilled water. The pads last a *lot* longer! Regards, Clyde "John M. Formsma" wrote: > Yes, but I noticed this happening on the systems that were only six months > old. Not just a little crud, but lots, and hard to remove. > > FWIW...I have one piano with the old system with the metal bar. Almost no > buildup, and it gets once a year changing. The pads looked very good, > considering.
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