you can purify water through several stages of microfiltration.

R. Jafferali has written:

'A stochastic model to simulate the structure and performance of microfiltration and the growth of animal cell cultures'

microfiltration , reverse osmation and final disinfection.

It is for drinking and industrial purposes.

NEWater is urine collected from our toilets to be recycled into safe drinking water. It goes through three procedures starting with microfiltration, reverse osmosis and then ultra-violet radiation. This is a clever way to recycle water but uses a large amount of energy.