An Ontario-based company has developed a new membrane technology for purifying drinking water and treating wastewater that costs less than half as much to produce as competing products. After researching I found that they use reverse osmosis as the mechanism, which calculates the size particles to be excluded and use pores that are capable of trapping such particles. This technique is becoming more widely used as costs seem to be lower than other techniques of the past.
http://www.waterworld.com/index/display/article-display/322063/articles/membranes/volume-1/issue-1/feature/trends-in-membrane-filtration-in-canada.html
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