| 11. | Sand filters were being bypassed because they often became clogged under the heavy flow.
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| 12. | Sand filters are easy to maintain, and they work well for most pool applications.
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| 13. | In 1934 the first rapid sand filter plant was built in Ayer Hitam in Penang.
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| 14. | First with sand filters and in 1935 with chlorination
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| 15. | Rapid sand filters are typically designed as part of multi-stage treatment systems used by large municipalities.
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| 16. | The plant was the first continuously operated slow sand filter plant in the U . S.
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| 17. | The pump house located on the property is wood frame, and features a reversible sand filter.
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| 18. | Slow sand filters and self-cleaning screen filters employ mechanisms other than backwashing to remove trapped particles.
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| 19. | In 1985, a new rapid sand filter plant replaced it across First Street beside the reservoir.
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| 20. | BMPs used in the bluebelt include stormwater wetlands, stream restoration, outlet stilling basins, and sand filters.
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