GENERAL NOTES
1.
When dissolving powders in sample tube, be sure to hold thumb on cap firmly while shaking.
2.
In all tests with this kit, ignore further color development after initial color neutralization.
3.
In both procedures (A and B) it is necessary totitrate the sample immediately after 30 seconds shaking.
4.
When dispensing drops, hold the FAS titrant bottle vertically.
PROCEDURE A
Free Available Chlorine (FAC)
1.
Rinse the sample tube and cap with water to be tested.
2.
Fill to 25 ml mark.
3.
Add one level No. 33 scoop of R502 (DPD powder), cap and shake for approximately 30 seconds.
4.
Add R501 dropwise keeping count of drops used until disappearance of pink color. Swirl the tube every
few drops.
5.
Multiply the number of drops times 0.2 to find CL2 content.
PROCEDURE B
Total Free Chlorine (TFC)
1.
Rinse sample tube and cap with water to be tested.
2.
Fill to 25 ml mark.
3.
Add one level No. 33 scoop of R459A (potassium iodide).
4.
Add one level No. 33 scoop of R502 (DPD powder). Cap and shake for 30 seconds to dissolve
powders.
5.
Add R501 dropwise, keeping count of drops used until disappearance of pink color. Swirl tube every
few drops.
6.
Multiply number of drops times 0.2 to find CL2 content.
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