Qualities of Good Disinfectant:

For being a good disinfectant, any chemical or agent should :

• be effective in destroying harmful micro-organism within available contact time,
• not have toxic effect on water or make water un-potable,
• leave residual counter the possible re-contamination,
• not require skilled manpower and costly equipment for its application, and it should be amenable to detection by practical, rapid and simple analytical techniques in the small concentration ranges to permit the control of disinfection process,
• be such that its concentration in treated water could be measured easily, and
• be economical and easily available.