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Granular filtration

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* Moderate typically means 90-99% reductions of larger pathogens (helminth ova and larger protozoans) and solids-associated pathogens, <br>but low(<90%) reductions of viruses and free bacteria, assuming no pre-treatment. With pre-treatment (typically coagulation),<br> pathogen reductions are typically >99% (high).<br> **High pathogen reduction means >99%.
==Acknowledgements==
* [http://www.who.int/water_sanitation_health/dwq/wsh0207/en/index5.html Managing water in the home: accelerated health gains from improved water supply]. WHO.
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