In small water supplies such as army troops, private plants and swimming pools, the most common disinfectants are

chlorine dioxide and potassium permanganate

In small water supplies such as army troops, private plants and swimmi

1.	In small water supplies such as army troops, private plants and swimming pools, the most common disinfectants are
A.	Iodine and bromine
B.	chlorine and bromine
C.	ozone and uv rays
D.	chlorine dioxide and potassium permanganate
Answer» C. ozone and uv rays