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Zeolite – A group of hydrated sodium aluminosilicates, either natural or synthetic, with ion exchange properties.
Zero Soft – Water with a total hardness less than 1. 0 grain per U. S. gallon, as calcium carbonate.
Zone of Aeration – The layer in the ground above the water table where the available voids are filled with air. Water falling on the ground percolates through this zone on its way to the aquifer.
Zone of Saturation – The layer in the ground in which all of the available voids are filled with water.
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Source: “Plumbing Terms” Standard Plumbing Supply. 11 Sept. 2008
