I have been living in my home for almost 7 years. Last week I opened my catch basin for the 1st time. It appears that the basin is 3ft deep, with about 2ft deep of sewage. This basin is inside my basement and the lid is sealed with concete. Is there a way for a homeowner to clean this out (shop vac or buckets), or do I need to contact a professional. If I must contact a professional, what can I expect to pay for this service? Also, what will happen if I do not have the sewage cleaned out?Thank you