The sewage pool is full of odor or biogas or other gases harmful to human body, which affects the geomantic omen of this land. It can be said that it is not a good place to take the house as the center and the square garden is 30 meters away.
Then where is a good place?
Find an inaudible place near the house and expand it by ten meters, so that the outside is not affected by Feng Shui.
The house you mentioned, don't say business is bad, even people can't live in it.
I'll give you an apt analogy: living here is like living on a toilet, and there is no difference.
You know what to do, right?
You can even find a Feng Shui master who knows mysterious Feng Shui, but there are few experts. I don't think you can find it.