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2. California Water Service - Wikipedia

   en.wikipedia.org/wiki/California_Water_Service

   California Water Service, commonly known as Cal Water, is an American company providing drinking water and wastewater services to a number of regions within the state of California. It was founded in 1926 and is based in San Jose, California , and provides service across multiple local districts, reaching more than 484,900 customers.

3. Cloth filter - Wikipedia

   en.wikipedia.org/wiki/Cloth_filter

   The woman on the right is putting a sari filter onto a water-collecting pot (or kalash) to filter water for drinking. A cloth filter is a simple and cost-effective appropriate technology method for reducing the contamination of drinking water, developed for use mainly in Bangladesh. Water collected in this way has a greatly reduced pathogen count.

4. Biosand filter - Wikipedia

   en.wikipedia.org/wiki/BioSand_Filter

   A biosand filter (BSF) is a point-of-use water treatment system adapted from traditional slow sand filters. Biosand filters remove pathogens and suspended solids from water using biological and physical processes that take place in a sand column covered with a biofilm. BSFs have been shown to remove heavy metals, turbidity, bacteria, viruses ...

5. Sand filter - Wikipedia

   en.wikipedia.org/wiki/Sand_filter

   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. The first two require the use of flocculant chemicals to work ...

6. Trickling filter - Wikipedia

   en.wikipedia.org/wiki/Trickling_filter

   Trickling filter. A trickling filter is a type of wastewater treatment system. It consists of a fixed bed of rocks, coke, gravel, slag, polyurethane foam, sphagnum peat moss, ceramic, or plastic media over which sewage or other wastewater flows downward and causes a layer of microbial slime ( biofilm) to grow, covering the bed of media.

7. Second Nature raises $16.4M for 'healthy home' subscription ...

   techcrunch.com/2020/03/25/secondnature-raises-16...

   Second Nature began its life solving a common homeowner problem: helping people to remember to change the home’s air filter. Often, this is a forgotten task as there’s no built-in reminder or ...