I have a garden pond about 6 feet by 12 feet by 3 feet deep. I can't keep the water level up and have left it sit for the past couple years. I'd like to repair it and get it going, but I also am not sure how the filtration system (plastic barrels with different filter media) was set up, and my husband (who set it up several years ago) has passed away. I remember that he lined the dug out area with old carpeting and heavy black plastic. I'm not sure if it can be repaired, or if it needs to be replaced. I know he used a submersible sump pump to send water through the filtration system. I'm afraid to even get an estimate locally for feat they'll take me to the cleaners! Any suggestions?