"Bacterial spare parts filter antibiotic residue from groundwater." ScienceDaily. ScienceDaily, 21 May 2013. <www.sciencedaily.com / releases / 2013 / 05 / 130521194001.htm>.

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Sask. researcher says filters made of agricultural residue can reduce arsenic levels in water Filtration system reduced 1,000 micrograms of arsenic per litre of water to less than 10 micrograms ...

Millions of people take pharmaceuticals, the residue of which ends up in our sewage system. This is a problem that toilet to tap had yet to solve.