best root killer?
I had the main drain from my house cleaned out this morning and also got a video (with souvenir cd!). I've had a root problem for many years. I tried a new drain cleaning company this time and they did a far more complete job than the one I used in the past.
They recommend putting root killer into the system twice a year. Can anyone recommend an especially good product? I'd love to be able to go a few years before having to have it cleaned out again. What has worked well for you?