In water treatment, which approach addresses cysts and oocysts most effectively?

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Multiple Choice

In water treatment, which approach addresses cysts and oocysts most effectively?

Protozoan cysts and oocysts resist chlorine-based disinfection, so a single disinfectant isn’t enough. The most effective approach combines both removal and disinfection: filtration captures cysts and oocysts, then UV treatment inactivates whatever remains. Filtering first reduces turbidity and physically removes most organisms, which also makes the subsequent UV light more effective at damaging the organisms’ genetic material. Relying on chlorine alone leaves these organisms viable; UV alone can be undermined by high turbidity or shielding if particles aren’t reduced; and doing nothing would allow infection.

Protozoan cysts and oocysts resist chlorine-based disinfection, so a single disinfectant isn’t enough. The most effective approach combines both removal and disinfection: filtration captures cysts and oocysts, then UV treatment inactivates whatever remains. Filtering first reduces turbidity and physically removes most organisms, which also makes the subsequent UV light more effective at damaging the organisms’ genetic material. Relying on chlorine alone leaves these organisms viable; UV alone can be undermined by high turbidity or shielding if particles aren’t reduced; and doing nothing would allow infection.

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