
Originally Posted by
Mikey
...and suggest that once in a while (I get the impression that this problem only occurs once in a while) a pretty good clog forms at the U-turn that plumber1 and I don't like. When that happens, the pipe backs up slowly as waste accumulates. When the toilets upstair flush, their waste encounters a closed pipe and as they fill up that pipe, the air in the pipe compresses and your toilet gurgles. Once things settle down, your trap drains slightly, lowering the water level. The clog can either clear itself or not -- the more pressure behind it, the more likely it will clear. If it does not, more and more waste will accumulate in the pipe, and will eventually overflow your toilet, which looks to be the lowest-level exit in this system. If this scenario is anywhere near accurate, it implies a lousy or nonexistent vent system, and a real need to straighten out that tangled web of pipe. There may be a Code provision in San Francisco that allows no vents if everything drains into a truly huge main line, but the route all that sewage is taking to get to that huge pipe invites clogs. I can't believe it would pass inspection.
Bookmarks