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![Side view of gravity sand filter. (Courtesy, Anonymous [n.d.]). | Download Scientific Diagram](https://www.researchgate.net/profile/Sandile-Ngcobo-6/publication/351024252/figure/fig5/AS:1015009807187978@1619008604861/Side-view-of-gravity-sand-filter-Courtesy-Anonymous-nd.png "Side view of gravity sand filter. (Courtesy, Anonymous [n.d.]). | Download Scientific Diagram")
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