The foundation of the house used to be a sewage pool. How to solve it from feng shui?

After you clean it thoroughly, buy a new broom every day and sprinkle the cinnabar you bought in the drugstore thoroughly. Then as soon as the sun comes out, start sweeping in a corner and don't set at all. Of course, this is symbolic. Don't push. After that, the red flag was inserted to break ground. All the dust was swept away.