Alkalinity|water quality parameter in which the pH is higher than 7.
Backwashing|a procedure that reverses the direction of water flow through a multi-media-type filter
Bleed-off|a method used to help control corrosion and scaling in a cooling tower.
Colloidal|a jelly-like substance made up of very small, insoluble, non-diffusible particles larger than molecules, but small enough to remain suspended in a fluid without settling to the bottom.
Concentration|indicates the strength or relative amount of an element
Cycles|___________ indicates when the concentration of an element in the water system has risen above the concentration contained in the makeup water.
Dissolved |_________ solids can contribute to the corrosion and scale formation in a system.
Electrolysis|the process of changing the chemical composition of a material by passing electrical current through it. 
Electrolyte|a substance in which conduction of electricity is accompanied by chemical action.
Fouling|a term used for problems caused by suspended solid matter that accumulates and clogs nozzles and pipes, which restricts circulation or otherwise reduces the transfer of heat in a system.
gpg|an alternate unit of measure sometimes used to describe the amounts of dissolved material in a sample of water.
Hardness|a measure of the amount of calcium and magnesium contained in water. 
Inhibitor|a chemical substance that reduces the rate of corrosion, scale formation, or slime production.
Mp/l|a chemical substance that reduces the rate of corrosion, scale formation, or slime production
Ppm|unit of measure used to specify exactly how much of a certain material or element is dissolved in a sample of water.
pH|a measure of alkalinity of water.
Scale|a separate compressor that uses the same source of refrigerant as those used by a related group of parallel compressors. 
Suspended solids|the amount of visible, individual particles in water or those particles that give water a cloudy appearance.
Total|the ------- amount of both dissolved and suspended solids contained in water.