To view a multimedia demonstration of this tutorial, click here . The demonstration requires Macromedia Flash 4 player. If you don't already have it, click here to get it. Water enters you house via the water main. Sometimes, before the water supply splits off to the hot water heater there will be a split between the indoor and outside water supply.
Wastewater exits the house through the wastewater system.
The first step in this system is the trap at each fixture. A trap is designed to retain a small amount of water so that sewer gas cannot come up through the pipes and enter into your home. The branch that goes up will make its way up through the roof to let in air to compensate for any vacuum that the water going down the pipe creates. Think of what happens when you hold your finger over the end of a straw that is full of water, when you release your finger the vacuum is broken and the water flows out. As the wastewater flows out and into the main sewer system, the water will pass a number of clean outs.