2, can not be empty: when placing the water tank, we must avoid this situation. It is best to fill it with water. If we don't like changing water frequently, then we can also put some sundries in the water tank to prevent it from being empty, otherwise it will easily lead to financial ruin.
3, don't be too high: the height of the water tank is too high, which will suppress the fortune and lead to the owner's bad fortune, so the height of the water tank must not exceed the human body.