Thank you all for the advice. I tried my 6gal shopvac and that is not going to work. I will call my septic company and see if they will do it, I had my septic pumped 3 weeks ago. A vac truck like the one posted is about $1500 to rent. If the septic place can't do it the the company installing the liner can clean it. Plus I fight 6"-12" of rain accumulation nearly every day.