Sewage
Sewage systems were first developed inside Dwarvish Holds so they can truly last forever without "filling up". For a long period of time building sewers in places without large bodies of water were one the most difficult problems of dalikind, but after the discovery of Silkspitter Worms our problems were solved.
There are sewers in almost all settlements today, and they either lead into a large body of water, or into a collection pit with Silkspitter Worms. The collection pits are rather dangerous, as the worms in there simply slowly devour anything that falls in - hence why sewers became a popular place for illicit organizations.
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