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A plumber came and snaked from a different tiolet and said the main drain had roots in it and that he would need to backhoe and put in a box.
Box? What box? What's it for? A box because he found roots? Get rid of him and call in a plumber with a sewer Cam, See what shape the sewer pipes are in and if he finds roots the go to the Garden Store and pick up a pound of Copper Sulfate , Pour a half pound in your toilet and flush it down. That will kill the roots, Then get a plumber in and snake the line with a cutter tip to break up the tangle od dead roots. There will be some plumbers that want to dig up and replace the line. Try this first. Good luck, Tom