2 1/2 months ago the floor drain started back up, called plumber to check for roots and blockage. They thougt roots since their snake would not come back. Anyway called the sewer guy to drain the 2 tanks that I had just had pumped the year before. Sewer guy said get an excavator need to see if any roots. Did that cleared a small gathering of roots form the 2nd tank. Extendend the drain field. A $1000.00 later I still have water coming from the floor drain and both tanks are full again. There is obviously something going on but can't figure it out. Any suggestions? :(