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SevernTrent's subcontractor carried out a routine drains cleanse at the bottom of the street about 20 houses away. We were in our house and heard lots of noises coming up the pipes. Water then poured out of the 1st floor toilet flooding the floor. It stopped after a few minutes. While my husband was cleaning up I spotted the subcontractor lorry at the bottom of the street. They said they were doing routine cleanses of the drains in the area. They say they would put a note on the system that that area should only be done with low pressure. But we think this happened as well last year when we were away and came back to our downstairs toilet wet and the floorboards warped. They say there is nothing we can do about it but is there something we can fix to the two waste pipes for the downstairs and upstairs toilet ? We're pensioners and I'm really anxious about preventing this. There was a rancid smell upstairs although the water looked clear. It's an old Victorian property and the neighbours next door have a new build and didn't have any water come in although we have a shared drain with them. Many thanks for any advice. We're happy to get a plumber out but want to check as we saw something online called a anti backflow valve.