What's the use of Gan Yuan Town House Stone?

It is used to guard the home, ward off evil spirits and pray for good luck.

Because the stone of Gan Yuan Town House can effectively suppress the evil spirit, which makes the house more and more stable in geomantic omen, it is used for guarding the house, exorcising evil spirits and praying for blessings. For the record, this answer is for reference only. Please don't be blind and superstitious.