1. R.Cullen , Ownership and Interest in Water Filtration Products, in Water Filtration - US - October 2017, Mintel Report , 2017
2. Assoc. Press , Michigan distribution water filters to residents of Flint , 2015
3. A.Biolchini , A testing prompts wolverine to offer water filters to more homes , MLive Media Gr. Grant Rapids Press , 2017
4. NSF International/ANSI , NSF Standard 42: Drinking Water Treatment Units—Aesthetic Effects , Ann Arbor , 2015
5. NSF International/ANSI , NSF Standard 53 Drinking Water Treatment Units—Health Effects , Ann Arbor , 2015