How did the Romans clean their polluted water?

Related questions

1. Why did the Aztecs build aqueducts?
2. What do you call a bridge over land?
3. What is the Aqueduct of Segovia made of?
4. Why was the Aqueduct so important?
5. Why did the Aztecs build causeways?
6. How old is the aqueduct at Nimes?
7. How long does it take to build an aqueduct?
8. Did Romans drink mead?
9. What is the Alaskan Way Viaduct?
10. What is foot over bridge?

Tags

1. #aqueducts
2. #built
3. #polluted
4. #needed
5. #cause
6. #controlled
7. #finally
8. #romans
9. #access
10. #water
11. #these
12. #drinking
13. #sewage
14. #early
15. #frequently
16. #people
17. #state
18. #their
19. #repairs
20. #mixed
21. #kilometers
22. #outbreaks
23. #clean
24. #stages
25. #pollution
26. #cholera
27. #prevent