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* [http://www.youtube.com/watch?v=j261j90JKZw Youtube movie on the siphon filter]
* [http://www.youtube.com/watch?v=d8bIyjFEbes Youtube movie on the Tulip filter]
* [http://www.youtube.com/watch?v=NSSeHXymkBw CrystalPur advertisement on Cambodian television]
==External Links==
* [https://www.diageogivingforgood.com/how_filters_work.aspx information on the CrystalPur filter]
