Have you seen a "fatberg?"
It's a combination of grease and other stuff that should not be put down the drain or flushed down the toilet.
The NYC Environmental Protection Department wants to show you how it all piles up.
PIX11 News visited the Newtown Creek Wastewater Treatment Plant in Greenpoint, Brooklyn and went on a tour with Deputy Commissioner Pam Elardo, P.E..
The facility is one of 14 locations that processes the discarded liquids and solids of the city.
More than 250 million gallons of stuff pass through this one location and the amount doubles on a rainy day.
The locations across the boroughs process and treat the flow from drains, toilets and sinks. Bacteria and heat help produce reusable substances, such as methane gas and clean water.
But there's a problem in the pipes. Clogs cost the city around $19 million year.
NYC DEP has started a new advertising campaign called "Trash it. Don't flush it."
Officials hope you'll reconsider flushing the "flushable wipes" and instead toss them in the regular garbage.