There are many reasons why water is not clean, as follows:

1. The sewage tank cover is not closed properly

2. The sealing strip inside the sewage tank cover is damaged or aged

3. The sewage suction pipe is not inserted properly or the sewage suction pipe is broken

4. The garbage trough in the middle of the head body is blocked by foreign objects

5. The rubber is worn and aged or foreign matter is attached to the rubber

6. The height (pressure) of the head is not adjusted to the proper position