POTASSIUM 1-4 MG/L
1-4 mg of potassium is needed to clean the waste water
K+
FLUORIDE 0.05 MG/L
0.05 mg of fluoride is needed to purify 1 liter of water.
Fl
Cl
CHLORIDE 6-15 MG/L
6-15 mg of chlorine per liter of water is used to purify the water
Cl
MAGNESIUM 4-10 MG/L
We need 4-10 mg of magnesium to clean each bacterium