(This is late because I changed my personal e-mail address and didn't get it changed for posting. Ruth) It sounds like their water softener is on overdrive, or they are adding salt. I used to see that occasionally before DC had its own treatment, when people who used distilled water would need to add a little salt to conduct electricity for the water light to work. If they added it each time with the water, rather than once right after a cleaning, you could get these large formations of salt crystals on top of the wicks. The best combination for cleanliness, no corrosion, and light function, is distilled water with DC's pad treatment. In most homes tap water is fine. It will show up quickly, definitely by six months, if distilled is needed. Ruth Phillips ruth at alliedpiano.com >Last week I ’ the system and was amazed to see big white mushrooms growing >above the humidifier pads!
This PTG archive page provided courtesy of Moy Piano Service, LLC