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The water treatment was based on slow sand filtration, and horse and cart distributed the water. Some three years later, the first water pipes were installed. The suggestion was made that every person should have access to safe drinking water, but it would take somewhat longer before this was actually brought to practice in most countries. 3. Desalted water and regenerated water uses 1. Desalted water sources and uses 2. Water regeneration technologies and uses 4. Desalination market 1. World desalination market 2. Situation in Spain 5. Costs of desalted water 1. Desalination cost evolution 2. Main factors affecting desalination costs 3. Breakdown of desalination costs 6. Apr 18, 2004 · operation of a water treatment plant with Six (6) months in a Class IIA, IIIA or IVA water treatment plant shall be required. Class III-A High School Diploma or GED and Three (3) years of acceptable operation of a water treatment plant with One (1) year of that experience in a Class IIA, IIIA or IVA water treatment plant shall be required. Download PDF Process Chemistry for Water and Wastewater Treatment, by Larry D. Benefield, Joseph F. Judkins, Barron L. Weand. Just link to the internet to get this book Process Chemistry For Water And Wastewater Treatment, By Larry D. Benefield, Joseph F. Judkins, Barron L. Weand This is why we imply you to use and utilize the developed technology.