I had a dry well drain for my kitchen sink and washing machine that started to run slower and slower. Contacted the local town and was informed I could not repair I had to reconfigure the drains in the house and tie into my septic system. Because the washer is in the basement it required a Drain pump with a vent attached. The first load of laundry when the pump came on there was a horrific smell coming from the septic(?). How do I prevent this in the future?