| RATE OF FLOW 
The quantity of water flowing past a designated point within a specified time, 
such as the number of gallons flowing past a point in 1 minute - abbreviated as 
gpm.
 REAGENTS
 
(chemical related) 
The chemical agents, dyes, indicators or titrants used in testing various 
aspects of water quality.
 RESIDUAL BROMINE  
(chemical related)  
The amount of measurable bromine remaining after treating the water with 
bromine. The amount of bromine left in the pool or spa water after the bromine 
demand has been satisfied.
 RESIDUAL CHLORINE  
(chemical related)  
The amount of measurable chlorine remaining after treating the water with 
chlorine. The amount of chlorine left in the pool or spa water after the 
chlorine demand has been satisfied. 
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