A crane master: What are the stresses of gourds commonly used in geomantic omen?

Hulu is loved by people because of its homophonic "Fulu", and there are also many stories related to Hulu in mythology. In geomantic omen, gourd can flourish Kun, so it can dissolve all kinds of evil spirits and invisible evil spirits. For example, apex, sound, electromagnetic evil, door and door collide with each other, and the foul smell in the toilet is solved; There is also the role of prosperous wealth, which can improve the yang of the house and achieve the effect of prosperous wealth; In addition, it can ward off evil spirits and make ghosts and gods afraid.

However, gourds used in geomantic omen are better than other containers and grow naturally. It must be a yin-yang melon, that is, one with an upper and lower abdomen and a thin waist in the middle. Moreover, the flesh inside must be removed, and it will be even more powerful if you can bless mana.