How to do the secondary drainage in the bathroom?

The following are the common practices of secondary drainage in general toilets:

Toilet drainage: Toilets are usually connected to drainage pipes on the ground. Connect the toilet to the sewer with an S-shaped or P-shaped elbow. In this way, when flushing the toilet, the wastewater will enter the sewer system through the elbow.

Wash basin drainage: Wash basin is usually connected to the drain of sewer. Connect the washbasin with the sewer with a curved drain pipe.

Shower drainage: Showers usually have a drainage pipe, which is usually located on the floor of the shower area. The drainage pipe is connected to the drainage pipe system, and the wastewater is led to the sewer through the drainage pipe.