In reply to Brian Trout's "Pure water isn't a very good conductor, or so I'm told.", the thing to remember is that DISTILLED water is an insulator, not a conductor. A water source labelled PURE could be anything, but probably not DISTILLED. More importantly, if DISTILLED water is used in the DC humidifier, the LWL sensor won't work. I haven't tested it, but I presume DC'S Humidifier Treatment has some electrolyte content. If so, distilled water would not cause a problem. It's easy enough to test, though, for anyone who wants to do so. On first installation, use distilled H2O with HT and see if the lights work. After a system has been in use for a while, there should be enough mineral deposit in the tank to provide eletrolyte (to conduct electricity across the terminals of the LWL or SHB sensors) even if you start using distilled water. Once again, it's easy to test the sensors. Remember that the SHB is connected to the humidifier circuit. It won't be powered unless the humidifier is. In other words, if the humidity is high enough to cause the dehumidifier circuit to be powered, you won't get any information about the SHB. If this is the case, one way to check is to plug the humidifier into the powered dehumidifier circuit. Then you'll have power to the SHB, and you can see if it's working or not. Bob Anderson Tucson, AZ
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