In the straight toilet, flushing from the outlet of the bai end was the main one, and flushing on both sides was supplementary. The feature of this type of toilet is that the heavier dirt at the bottom of the toilet is flushed more cleanly, while the sides (facade) of the toilet are not ideal.

The horizontal flushing toilet has the same flushing volume and pressure around it, and the entire toilet flushes more evenly, but requires a larger amount of water.

Summarized to the main sewage pipe, as the name suggests. Straight toilets are mainly flushed from the front water outlet, which is to raise the ground. The drain pipe runs on the original ground, and the flushing on both sides is supplemented. This type of toilet features horizontal row, which is the same layer of drainage.