I am turning to this estimable forum because I have always found the people here really know what they're talking about and have been of help over and over again. Fifteen years ago we replaced the main sewer waste line from our house to the city line and then about 5 years ago, after repeated clogging, we replaced the part of the line under the house. That work was done by a company we were referred to by our then plumber. Since it was underneath we have no idea whether the work was done well or not. In the past few years we have had repeated clogging and our new (great plumber) snaked it out once and pulled out tons of roots which did not surprise us as we have ficus, privet and evergreen elm on our lot, all planted by previous owners. So when it clogged again this week after the big rains, I was ready to ask him to use RootX (recommended here) after the clean out. To my shock, however, there were really not any roots, just impacted crap. It was his opinion that there was something wrong with the line under the house where the clog was occurring. He was getting ready to go to Mexico for three months (though his brother will handle emergencies in the duration) but that when he got back he would send a camera down and figure out what had to be replaced. This all makes sense to me(and he is a very good, very reliable plumber worth waiting for) but I am desperate to try and avoid problems until his return. Since RootX isn't going to be the panacea I had hoped, is there anything else I can dump down toilets occasionally just to slow down the accumulation of impacted sludge? Thanks.