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2. Drain-waste-vent system - Wikipedia

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

   Drain-waste-vent system

3. Floor drain - Wikipedia

   en.wikipedia.org/wiki/Floor_drain

   Floor drain - Wikipedia ... Floor drain

4. Air gap (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Air_gap_(plumbing)

   Air gap (plumbing)

5. How to Clear a Clogged Sink Drain - AOL

   www.aol.com/clear-clogged-sink-drain-151500237.html

   Learning how to unclog a sink starts with understanding which methods work for the type of pipes you have. Take, for instance, boiling water. If you have metal pipes and you suspect hair, soap ...

6. Backwashing (water treatment) - Wikipedia

   en.wikipedia.org/wiki/Backwashing_(water_treatment)

   Backwashing is a form of preventive maintenance so that the filter media can be reused. In water treatment plants, backwashing can be an automated process that is run by local programmable logic controllers (PLCs). The backwash cycle is triggered after a set time interval, when the filter effluent turbidity is greater than a treatment guideline ...

7. Drain (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Drain_(plumbing)

   Drain (plumbing)

8. Laundry wastewater - Wikipedia

   en.wikipedia.org/wiki/Laundry_wastewater

   Wastewater comes out of the laundry process with additional energy (heat), lint, soil, dyes, finishing agents, and other chemicals from detergents. [1] Some laundry wastewater goes directly into the environment, due to the flaws of water infrastructure. The majority goes to sewage treatment plants before flowing into the environment.

9. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   Water softening - Wikipedia ... Water softening