If I have to treat the line annually with Vaporooter why don’t I just wait for the pipe to block and then call a plumber?
Once trees have entered your sewer line you unfortunately have an ongoing problem. Usually sewer blockages occur when the plumbing system is being heavily used. When there are a lot of people at home like school holidays, Christmas and Grand Final day. This will result in inconvenience and a costly call out fee to a plumber.