http://blogs.washplus.org/drinkingwaterupdates/2012/06/a-randomized-controlled-trial-of-the-plastic-housing-biosand-filter-and-its-impact-on-diarrheal-disease-in-copan-honduras/ from the WASHplus Project Tue, 22 Sep 2015 12:34:42 +0000 hourly 1 http://wordpress.org/?v=3.1.4