104 {Ans: maximum temperature for a spa is _____ degrees}total alkalinity {Ans: the buffering capacity of the water to maintain its current level of pH; defined as amount of carbonates and bicarbonates in the water}causes of corrosion {Ans: too low pH, alkalinity or calcium hardness}free available chlorine {Ans: chlorine that is available for disinfection in the water}total dissolved solids {Ans: TDS; matter that is in the water that is unable to be reduced or eliminated with chemicals}floculent {Ans: filter aid that makes small dirt bigger}