Computer · Environmental Engineering
The primary cleaning operation for a slow sand filter is accomplished by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1passing compressed air through the filter media.
- 2reversing the direction of flow of water (backwashing).
- 3scraping off the top thin layers of sand and admitting water.✓
- 4passing a chemical solution of alum and lime through the filter.
Correct answer
scraping off the top thin layers of sand and admitting water.
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