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Is filtration rate important?

April 26, 2017filtration rate

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Is filtration rate important?

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Constant flow? Very! Too high filtration rate and breakthrough of pathogens is possible. That is why the accepted maximum filtration rate is .1 gpm/ft2 for sand surface. Beware of systems that purport to be “slow sand filters” that use much higher filtration rates to sell a smaller footprint. These are not true slow sand filters. Slow sand filters work best when operated under constant flow conditions using storage to buffer demand.