We were not sure what to expect, since the product is so well priced. However it seems to work quite well. For instance, our pipes (according to the plumber ) seem to narrow from the cellar to the ascending floors (3/4 to 1/2). The old copper pipes and system don’t have a lot of wiggle room, so to speak. I’m guessing that’s why we’ve had a few clogging issues. Anyway, this seems to address the issues pretty effectively.
RWH via Homedepot.com Virginia