Does the bean sprout machine need to change water?

There are generally two ways to drench the buds: one way is to drench the buds with more water each time, and at the same time, the buds in the whole container should be thoroughly drenched, and the heat of each part of the buds in the whole container must be adjusted evenly until the water temperature flowing out is consistent with the water temperature during drenching. The other is to fill the whole container with water, so that the water level is about 2 cm higher than the surface of bean sprouts, so that bean sprouts in the container are generally immersed in water, and then all the water is discharged or emptied. This is repeated for 1 ~ 2 times until the temperature of sprouts in all parts of the container is adjusted evenly.