http://blogs.washplus.org/drinkingwaterupdates/2012/03/efficacy-of-ceramic-water-purifiers-coated-with-colloidal-ag-doped-tio2/ from the WASHplus Project Tue, 22 Sep 2015 12:34:42 +0000 hourly 1 http://wordpress.org/?v=3.1.4