free chlorine test kit for water analysis
In the water and by the pool free (active) chlorine ppm (mg/l)
- denominated measures.
the test for free chlorine (o-tolid for):
1 - a petri dish with 10 ml. fill in sample .
2 - 2 drops On the O-tolid the shake and damlatip
wait for 5 minutes .
3 - yellow compare with color scale.
in December, normal 0.5 - 1.0 ppm