F5 chem-------點解唔用哂氯黎漂白???

Both chlorine and sulphur dioixide have pungent smell and acidic when dissolved in water. Howevr, chlorine is more corrosive and stronger oxidizing/bleaching agent that sulphur dioxide and thus chlorine may attack the bleached surface. If the stuff to be bleached is delicate or react with chlorine, sulphur dioxide is a better choice.

cl2 is a strong element that contain bleaching power
but it may hurt or demage the material
it is not we want to c

Therefore, we choose to use the element with less active than cl2

太恐怖了！
高濃度的氯水容易揮發出有毒氯氣，遇上酸即更直接產生氯，隨時有生命危險。