There are several main ways of flushing, the first is straight flush, sitting toilet is the use of water impulse to discharge dirt. The advantage is that the flushing pipe is relatively short, and the diameter of the flushing pipe is relatively thick, and the gravity acceleration of the water can be used to flush the dirt, in terms of water saving, the direct flushing toilet is still very good.
The second type is a siphon type toilet pipe into an S-type, through the suction in the electrical appliances to remove the stolen goods, flushing noise is relatively small.
Both types of toilet have their own advantages, of course, they also have their own disadvantages, such as the noise of the direct flush type is relatively large, and the siphon type of toilet is relatively wasteful of water.