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slow sand filters

08/09/2018 / By Edsel Cook

Old biological filters work better than new water treatments, according to Swedish study

An old water treatment technology called slow sand filters could be making a comeback – and the older filters would work better than both newer ones or modern filtration methods. According to Science Daily, a Swedish study suggests that the older the filter, the better it is for treating water. Slow sand filters first appeared during […]

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