Why shouldn't I pour oil or paint down the sink? And what should I do instead?

Australia's sewerage system is at risk from the improper disposal of cooking oil, paint, and other chemicals. The water industry has no control over what people do in their homes, so it's up to them to dispose of these liquids properly. Fats, oils, grease, and paint are the worst culprits, as they rapidly cool and solidify in sewer pipes. Western Australia's Water Corporation estimates 30% of sewer blockages are due to fats, oils, and grease. These materials can combine with other materials flushed down the toilet, creating fatbergs, which can build up at choke points in sewer systems.