Comments on: Retired 3M engineers create a solar water pasteurizer http://blogs.washplus.org/iaqupdates/2010/11/retired-3m-engineers-create-a-solar-water-pasteurizer/ from the WASHplus Project Sat, 19 Sep 2015 07:30:10 +0000 hourly 1 https://wordpress.org/?v=4.4.4