4
Option 1: Range 0 - 5.00 mg/l (ppm)
Colourless - Red
1 Rinse test tube with sample leaving two or three drops in the tube.
2 Add one DPD No1 tablet, crush tablet and then fill the test tube with sample to
the 10 ml mark. Mix to dissolve tablet and ensure any remaining particles have
settled.
3 Take photometer reading at immediately as result may drift on standing. Ensure
the display shows the Chlorine-Free/5 test is selected.
4 Retain test solution if Total Chlorine test required.
Test 1
FREE CHLORINE
Option 2: Range 0 - 10.0 mg/l (ppm)
Colourless - Red
1 Rinse test tube with sample leaving two or three drops in the tube.
2 Add one DPD-XF tablet, crush tablet and then fill the test tube with sample to
the 10 ml mark. Mix to dissolve tablet and ensure any remaining particles have
settled.
3 Take photometer reading immediately, as result may drift on standing. Ensure
the display shows the Chlorine-Free/10 test is selected.
4
Retain test solution if Total Chlorine test required.
Test 2
TOTAL CHLORINE
Option 1: Range 0 - 5.00 mg/l (ppm)
Colourless - Red
1 Carry out this test on the solution remaining from the Free Chlorine/5 test.
2 If any shock treatment chemicals have been added to the pool, add one DPD
Oxystop tablet, crush and mix to dissolve. This will prevent a response caused
by the shock treatment chemicals.
3 Add one DPD No 3 tablet, crush and mix to dissolve.
4 Stand for two minutes.
5 Take photometer reading. Ensure the display shows the Chlorine-Total/5 test is
selected.
