Bubbles from toilet bowl

: I have just installed a shower, washbasin and toilet in my basement, using the roughed in plumbing provided by the builder. The toilet is an Eljer Murray model and seems to work OK, however, after the bowl water leaves the the bowl in the flush cycle, and the bowl begins to fill to its normal level, bubbles about 2-4 inches in diameter, bubble up from the drain for about 3-4 seconds, then stop. It does this during every flush cycle. Ive never seen this before, any ideas.: Note to Sylvan: Do you have any specific comments about the Eljer Murray? sounds like a lack of vent problem, back pressure from flushed water causing air to bubble back. try disconnecting the lavatory drain trap and flushing toilet.

: I have just installed a shower, washbasin and toilet in my basement, using the roughed in plumbing provided by the builder. The toilet is an Eljer Murray model and seems to work OK, however, after the bowl water leaves the the bowl in the flush cycle, and the bowl begins to fill to its normal level, bubbles about 2-4 inches in diameter, bubble up from the drain for about 3-4 seconds, then stop. It does this during every flush cycle. Ive never seen this before, any ideas.: Note to Sylvan: Do you have any specific comments about the Eljer Murray? Eljer is a decent product. About the bubbles it is a venting problem. Possibly missing or blocked. You may want to contact the builders plumber and have him perform a smoke test. GL Sylvan

: sounds like a lack of vent problem, back pressure from flushed water causing air to bubble back. try disconnecting the lavatory drain trap and flushing toilet.Thank you both for the quick replies. The house is 10 years old and the builder isnt active in my area any more. I cant totally eliminate the sink trap from the system due to an inadvertant up and down run of pipe inside a wall which creates a second trap.If I can live with the curious bubbles, is there any hazard or sanitary reason why I cant leave it as is? The flushing action appears satisfactory, would it improve dramatically if I rectified the vent? Any chance of toilet waste coming up the sink or shower?Thanks for your patience.

Did you ensure all test plugs where removed from the drain ??

: : sounds like a lack of vent problem, back pressure from flushed water causing air to bubble back. try disconnecting the lavatory drain trap and flushing toilet.: Thank you both for the quick replies. The house is 10 years old and the builder isnt active in my area any more. I cant totally eliminate the sink trap from the system due to an inadvertant up and down run of pipe inside a wall which creates a second trap.: If I can live with the curious bubbles, is there any hazard or sanitary reason why I cant leave it as is? The flushing action appears satisfactory, would it improve dramatically if I rectified the vent? Any chance of toilet waste coming up the sink or shower?: Thanks for your patience. :-)I cant forsee any hazard or sanitary reason for worry. you may get a little sewer gas odor from the bubbles as time goes by. this problem in itself shouldt cause back up. the reason I suggested removing the trap was to open that line as a vent to test flushing. you might try a wet vac. to clear line and then test flush to seee if its worthwhile to proceed with rectifing the vent. I get a java scrip error on the bulletin board so this will be my last post this month until whatever post causing it scrolls off. if you have any other questions, e-mail me.

: Did you ensure all test plugs where removed from the drain ??I ran several buckets full of water down each drain (shower, sink and toilet) before installing each fixture, so I assume that no test plugs were present. Since these roughed in drain pipes remained unused for about 10 years while the rest of the house plumbing was operational, is it possible that scum builds up in them and may wash away with increased use? If so, perhaps the problem will cure itself.