Number | Name | Date | Kind |
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6216092 | Kong | Apr 2001 | B1 |
Entry |
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“Water Softener Operation: Anatomy and Operation of a Water Conditioner”, Air & Water Quality,Inc. (www.awqinc.com/softener.html), 2 pages. |
Rundle, Chris C.; “Beginners Guide to ISE Measurement,” (www.nlco2000.net), May 5, 2000, Chapters 1-4. |
“Standard Methods for the Examination of Water and Wastewater,” Edited by L.S. Clesceri, A.E. Greenberg & R.R. Rhodes Truessell, 17th Edition, 1989, pp. 2-59-2-65. |