• On March 2, 1988, Water Soft was purchased by Amtrol Inc. Over 30 years prior to the purchase of Water Soft, Amtrol introduced the first pre-pressurized diaphragm expansion tank to the water systems industry. At that time Amtrol was the leading manufacturer of water systems tanks in the world and was looking to enter into water treatment. • On February 29, 1980, Water Soft purchased the entire water treatment division of the F.E. Myers Pump Company.