I am having problems with my clean-out and the house/toilets backing up. There is a large tree over the discharge line and it is backing up into the house on a regular basis. I have snaked the line at least twice a year for the past three years but constantly worry about it overflowing again. I don't really want to have to put in a new line and incur that cost. A friend told me about something on this old house where they scoped the line and then put in a product that they could inflate to keep the roots from continually blocking the drain. Please help.