2007-01-29 10:18:38 · 5 answers · asked by Aykut O 2 in Travel ➔ Asia Pacific ➔ China
There are a number: flocculating agents, pH control, disinfectants, etc. I suspect you are asking about the latter group. In the US and much of the world, gaseous chlorine is commonly used, on a smaller scale is sodium hypochorite or calcium hypochlorite, very small plants sometime use iodine-containing materials due to the problem of formation of trihalomethanes when using chlorine (which is more chemically active). In parts of Europe, they are moving away from chemical disinfection to UV irradiation, but this does nothing to prevent later contamination as does a chlorine residual. Hope this helps.
2007-01-29 13:56:57 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Chlorine
2007-01-29 18:23:15 · answer #2 · answered by ramarro smith shadow 4 · 0⤊ 0⤋
Sodium Hypochlorite ( BLEACH )
UN1791
2007-01-29 18:27:28 · answer #3 · answered by bigfred1954 4 · 0⤊ 0⤋
chlorine
2007-01-29 21:40:10 · answer #4 · answered by ara2680 2 · 0⤊ 0⤋
i woudl say chlorine
2007-01-29 18:25:52 · answer #5 · answered by sevenout7 4 · 0⤊ 0⤋