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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

3. Septic tank - Wikipedia

   en.wikipedia.org/wiki/Septic_tank

   A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater flows for basic sewage treatment. [2] Settling and anaerobic digestion processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as "primary treatment"). [2]

4. Dry toilet - Wikipedia

   en.wikipedia.org/wiki/Dry_Toilet

   Dry toilets (in particular simple pit latrines) are used in developing countries in situations in which flush toilets connected to septic tanks or sewer systems are not possible or not desired, for example due to costs. Sewerage infrastructure costs can be very high in instances of unfavorable terrain or sprawling settlement patterns.

5. Flush toilet - Wikipedia

   en.wikipedia.org/wiki/Flush_toilet

   A flush toilet (also known as a flushing toilet, water closet (WC); see also toilet names) is a toilet that disposes of human waste (i.e., urine and feces) by collecting it in a bowl and then using the force of water to channel it ("flush" it) through a drainpipe to another location for treatment, either nearby or at a communal facility.

6. 12 Things You Should Never Flush Down the Toilet - AOL

   www.aol.com/finance/12-things-never-flush-down...

   Cotton. Q-Tips, cotton pads, cotton balls, and similar bathroom products will expand and clump, causing potential clogs, and should go in the trash — not the toilet.

7. Blackwater (waste) - Wikipedia

   en.wikipedia.org/wiki/Blackwater_(waste)

   Blackwater in a sanitation context denotes wastewater from toilets which likely contains pathogens that may spread by the fecal–oral route.Blackwater can contain feces, urine, water and toilet paper from flush toilets.