There is a small clean water area at the toilet trap of a ceramic toilet.
This area is called the shallow water area, as shown in the figure below:
- This small area involves sophisticated design and is a key focus in toilet R&D. A rational design is a hallmark of a high-quality toilet.
- The water level in this area should be 55–65 mm. If too low, back odor will occur, causing unpleasant smells in the bathroom from time to time. If too high, splashing will happen, leading to discomfort during use.
- The position of the shallow water area is also critical. Even a difference of a few millimeters can lead to a noticeable effect. The shallow water area should not be too far forward, otherwise waste will drop directly into deep water and cause splashing. It should not be too far back either. Waste should land on the glazed ceramic surface covered with a thin layer of water to prevent staining and sticking.
- The front of the shallow water area should be designed with a slight slope. Avoid large flat bottoms or large rounded surfaces. This design effectively eliminates splashing.
- The ceramic surface of the shallow water area must be free of breaks, grooves, and dead corners, otherwise persistent odors will develop over time.
- The center of the jet hole under the shallow water area must align with the center of the toilet trap to ensure strong flushing power.
