Mystery #2Tier 2microbes clean water
How do microbes help clean the dirty water that leaves our homes?
Every time you flush the loo or empty the bath, dirty water rushes away down the drain. Somehow, before it ever reaches a river or the sea, most of that mess is taken out of it. Big machines help, but a lot of the real cleaning is done by something alive and far too small to see. What could be tidying up all that waste?
Your guess
What do you think happens to the dirt and waste floating in the dirty water?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.