Hello List, I will attempt to apply some light to this issue. I am a chemist by training so here goes....... The comments Mitchell Smith provided were accurate. We have only had two situations where damage has been caused to a piano by corrosion. In one case a "humidifier treatment" containing hydrochloric acid was added to the humidifier. In the other case the "humidifier treatment" contained a chlorine-based oxidizing agent. In both cases the piano owner went to the local store to get humidifier treatment. Unfortunately they purchased the type of humidifier additive commonly known as a descaler. Our product contains an ingredient which inhibits mold and mildew, provides no descaling action, and is not corrosive. We have done our best to educate technicians and piano owners in the need to use Dampp-Chaser Humidifier Treatment to avoid any confusion. We submitted it to exhaustive testing to determine that no problem could occur. Now we currently void any waranty if there is evidence that another additive caused damage to the piano. The Humidifer Treatment we sell is designed to prolong pad life. It is one part of our three prong approach to humidifier maintenance. First we recommend the Smart Heater Bar, secondly we recommend Dampp-Chaser Humidifier Treatment, and thirdly we recommend pads be changed at least once a year anyway. All this is designed to meet maintenance needs when the owner is unlikely to carefully monitor the Climate Control System. I hope this helps to clarify the role of chlorine. Please note that chlorinated tap water is so dilute in chlorine content that it will not cause a problem. Roger Wheelock, VP Dampp-Chaser Corp.
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