R-0630 is the second of 2 reagents used in the test for sodium chloride. R-0630 is added to 10mL of pool water to produce a color change to yellow. Then, R-718 Silver Nitrate Reagent is added drop by drop to produce a color change to milky red ("salmon color"). The required number of drops is multiplied by 200 to determine salt levels in ppm. This bottle contains 0.75oz or enough for 500+ tests.
