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  2. Biosand filter - Wikipedia

    en.wikipedia.org/wiki/BioSand_Filter

    The "swirl and dump", or wet harrowing cleaning technique, is used to restore flow rate. About 1 US gallon (3.8 L) is poured into the filter before cleaning (assuming the filter is empty). The upper layer of sand is then swirled in a circular motion. Dirty water from the swirling is dumped out and the sand is smoothed out at the top.

  3. Slow sand filter - Wikipedia

    en.wikipedia.org/wiki/Slow_sand_filter

    Slow sand filters slowly lose their performance as the biofilm thickens and thereby reduces the rate of flow through the filter. Eventually, it is necessary to refurbish the filter. Two methods are commonly used to do this. In the first, the top few millimetres of fine sand is scraped off to expose a new layer of clean sand.

  4. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    gravel > 50% of coarse fraction retained on No.4 (4.75 mm) sieve clean gravel <5% smaller than No.200 Sieve GW well-graded gravel, fine to coarse gravel GP poorly graded gravel gravel with >12% fines GM silty gravel GC clayey gravel sand ≥ 50% of coarse fraction passes No.4 (4.75 mm) sieve clean sand SW well-graded sand, fine to coarse sand SP

  5. Sand filter - Wikipedia

    en.wikipedia.org/wiki/Sand_filter

    Sand filter used for water treatment. Sand filters are used as a step in the water treatment process of water purification. There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world.

  6. Piranha solution - Wikipedia

    en.wikipedia.org/wiki/Piranha_solution

    The resulting mixture is used to clean organic residues off substrates, for example silicon wafers. [1] Because the mixture is a strong oxidizing agent , it will decompose most organic matter , and it will also hydroxylate most surfaces (by adding –OH groups), making them highly hydrophilic (water-compatible).

  7. Can I use sand as cat litter? We asked a vet to find out! - AOL

    www.aol.com/sand-cat-litter-asked-vet-120000565.html

    Avoid builder’s sand or sand from unknown outdoor sources, as they can pose health risks. Always store sand in a clean, dry place to prevent contamination before use. Other cat litter alternatives

  8. Sandblasting - Wikipedia

    en.wikipedia.org/wiki/Sandblasting

    Cleaning operations using abrasive blasting can present risks for workers' health and safety, specifically in portable air blasting or blast room (booth) applications. There is a large amount of dust created through abrasive blasting from the substrate and abrasive. [18]

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