103. PHENOL RED106. PRESSURE GAUGE112. RATE OF FLOW115. RESIDUAL CHLORINE
An abbreviation for oxidation reduction potential. It is a measurement of a body of water’s ability to oxidize contaminants. Measured with an electrode and an electronic meter. It is an indication of the sanitizing level or degree of safety from disease in the water. Measured in millivolts with the accepted minimum level being 650 mV (millivolt).
A chemical reagent dye used to test for pH. It can measure pH from 6.8 to 8.4.
A gauge with an analog dial indicating the pounds per square inch (psi) of pressure that has built up within a closed container, such as a filter.
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.
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.
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.