Subject: How is drinking water still contaminated after purification?
Date: Tue Nov 22 22:41:39 2005
Posted by Terrence
Grade level: 7-9
School: North Kenwood Oakland Charter School
City: Chicago State/Province: Illinois
Area of science: Earth Sciences
I'm asking this because i don't understand how drinking water can still contain
things such as coliform bacteria and nitrate even after the purification
process and why this is so.
Re: How is drinking water still contaminated after purification?
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