There are two septic tanks behind the house. What are the disadvantages from the perspective of geomantic omen?

Northwest orientation: Divination is dry, representing the sky, representing parents at home, belonging to gold, commonly known as Shoushan, and the Lord is noble and prosperous. Northwest wind, biting ice, so the mountain is not high and unreal, does not block the wind and rain, does not release the cold, which is not conducive to vitality and family development. Therefore, the first choice is that the northwest direction should be high, not low, and there should be no road rushing into the river to kill people. Therefore, building septic tanks in the northwest is very bad for the elderly.