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This web page tsshvac.blogspot.com states the following, "Total System Services TSS has been providing Commercial HVAC Heating Ventilation Air Conditioning and Facility Maintenance Services in Boise, Idaho, Portland, Oregon, Seattle, Washington and other Pacific Northwest cities for more than 25 years since incorporating in 1985." We saw that the webpage said " Tuesday, July 28, 2015." It also said " Is Coil Corrosion Impacting Your HVAC System? Pitting corrosion is caused by exposure to fluoride within the water supply, or through chloride found in a variety of products such as detergents and cleane."