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A simpler and less expensive form of arsenic removal is known as the Sono arsenic filter, using three pitchers containing cast iron turnings and sand in the first pitcher and wood activated carbon and sand in the second.<ref>{{PDFlink|[http://www.unu.edu/env/Arsenic/Munir.pdf Evaluation of Performance of Sono 3-Kolshi Filter for Arsenic Removal from Groundwater Using Zero Valent Iron Through Laboratory and Field Studies]|272 [[Kibibyte|KiB]]<!-- application/pdf, 279183 bytes -->}}</ref> Plastic buckets can also be used as filter containers.<ref>{{PDFlink|[http://phys4.harvard.edu/~wilson/arsenic/remediation/SONO/As%20filtration%20pictures.pdf SONO ARSENIC FILTER FROM BANGLADESH - 1]|102 KiB<!-- application/pdf, 105080 bytes -->}} - pictures with descriptions.</ref> It is claimed that thousands of these systems are in use and can last for years while avoiding the toxic waste disposal problem inherent to conventional arsenic removal plants. Although novel, this filter has not been certified by any sanitary standards such as NSF, ANSI, WQA and does not avoid toxic waste disposal similar to any other iron removal process.
In the United States small "under the sink" units have been used to remove arsenic from drinking water. This option is called "point of use" treatment. The most common types of domestic treatment use the technologies of adsorption (using media such as Bayoxide E33, GFH, or titanium dioxide) or [[reverse osmosis]]. [[Ion exchange]] and [[activated alumina]] have been considered but not commonly used.
===Large-scale water treatment===
