http://www.iwawaterwiki.org/xwiki/bin/view/Articles/Turbidity
Shows different ways to clean water and reduce water turbidity

These articles have information about how water transmits as well as ways to clean the water. The main cleaning systems are for microorganisms and disease, NOT turbidity.

http://www.lenntech.com/library/diseases/diseases/waterborne-diseases.htm
http://www.lenntech.com/processes/disinfection/disinfection.htm
http://trojanuv.com/applications/wastewater
http://water.epa.gov/scitech/wastetech/upload/2002_06_28_mtb_uv.pdf
http://water.epa.gov/type/rsl/monitoring/vms55.cfm