sewage pump problem

[smokeytires]

I have a problem with when ever the sewage pump empies out it blews bubbles in the upstairs toilet. Should the sewage pipe coming out of the pump empty before or after the vent line going out of the roof.
S/T

[Sylvan Tieger]

After the vent pipe!!!!!!! Prior to the main vent you will cause the waste to push air up the vent stack and that will cause back pressure omn the vent system

[Sylvan Tieger]

[quote="peterjames"]Call a professional sewage pump cleaners they will give good suggestions for come out this problem.[/quote]

What would a sewer pump cleaner know about proper venting or fixture units or flow rates?

Cleaning the sump and or impeller will not stop the bubbling. Possibly scouring (water jetting) the soil and waste / vent lines could restore full flow but just cleaning the ejector would do nothing for the above condition