ZEOLITE - A natural mineral (hydrous silicates) that has the capacity to absorb hardness, calcium, and magnesium ions from water.

ZEOLITE SOFTENING - Refers to the process, where zeolite chemicals are capable to exchange ions with the hardness causing impurities of the water.

ZETA POTENTIAL - The difference in voltage between the surface of the diffuse layer surrounding a colloidal particle and the bulk liquid beyond.

ZONING - The practice of dividing a building into small sections for heating and cooling control. Each section is selected so that one thermostat can be used to determine its requirements.