what is the purpose of a check valve? I'm getting city sewer backup and the city suggest this instead of fixing problem in main line. There are roots growing in the main and the tree is a very big willow(most likely) about 100 feet away on private property. The main gets plugged up several times a year and the town says the will just ream it out. If a pipe has already been compromised with roots , wouldn't the reaming process further weaken it. If I put in a check value won't I still get backups(my own) from washing machine overflowing my toilet. Currently I took the sewer cap off in the cellar , so if I have backup it goes there. Then I call the town and they blow up the lines. If I leave the cap on my first floor toilet will overflow and I get all the waste backing up into my living room. The town health board says its not their problem. Any suggestions
thanks Steve
thanks Steve