Very interesting:

AUSTRALIANS could be drinking treated sewage within a decade thanks to "good" bacteria in clean water feasting on germs.

CSIRO researchers injected treated sewage into a Perth aquifer as part of a $3million trial of the water for domestic, agricultural and industry use.

The researchers found that natural bacteria in the aquifers "eat" dangerous germs and viruses.

Further tests will investigate whether the aquifers can be used as part of the water treatment process.

What a great story. It has familiar elements -- bacteria, sewage, the need for clean drinking water -- plus a surprise ending.