When my house was built in 2005 the builder added plumbing hookups for a basement bathroom. 9 years later I got around to adding the hardware to finish the bathroom. There is a shower, single basin sink, and toilet (brand new eljer diplomat) - see attached sketch for layout. At first everything seemed to be working fine. We have been using the shower and sink with no issues and the toilet seemed to be working good as well. However, I noticed that the toilet would show signs of a slow flush. At first I thought there was some correlation between the shower being on and the slow flush. Since the shower was ahead of the toilet leading out to city sewer I figured the shower was disrupting flow. Well, then it started happening even when shower was not on. So, I've plunged the toilet numerous times. I pulled the toilet snaked the drain (I have intentionally used the toilet only lightly to make sure everything was working fine - so did not think there would be any issues with blockages). Reinstalled wax ring and toilet and still flushes slow. I noticed that the sink gurgles pretty bad when I flush the toilet. I also snaked the sink drain all the way to the main line. The sink does have a studor vent connected. I am afraid I have venting issues which would require much cost and effort to fix. Any advice would be appreciated.
Update: I thought maybe the studor vent was malfunctioning since I seemed to get a better flush with the vent removed from sink system. However, I checked the vent by sucking and it seemed to flow air very good. Then after pouring a few buckets of water down the sink the flush is very very slow - almost non existent. Is the toilet flow backing into the sink branch??
Thanks
Update: I thought maybe the studor vent was malfunctioning since I seemed to get a better flush with the vent removed from sink system. However, I checked the vent by sucking and it seemed to flow air very good. Then after pouring a few buckets of water down the sink the flush is very very slow - almost non existent. Is the toilet flow backing into the sink branch??
Thanks
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