Sewage Ejector Pump Bubbles

Out basement floor has what the plumber called a "sewage ejector pump" to pump the sewage up to the ground floor so gravity can take it away. But once in a while I hear a strong bubbling sound coming from the cavity where the sewage goes before it is pumped out. Plus, there have been days where you can smell the sewage.
Is the Bubbling normal? Plumber didn't seem concerned... should I be?
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snipped-for-privacy@gmail.com wrote:

I only have one at work, so my experience is limited, but I have NEVER smelled sewage, and you never should. As for the noise, two thoughts. water draining in from a location where the drains are quiet. Second, mine has a check valve ~5 feet up, it then goes up, over and then down. This 'loop' causes a vacuum to develop after the pump has run, making a funny water running, maybe bubbling sound.
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Bubbling??? Hummm.... check valve going bad??? I assume its installed vertically. If that lets go maybe you would here the left over water going back down the pipe into the sewage container.
As for the smell... The unit should be vented to the outside world. It should really never smell at all. Check and make sure the vent for its free and clear.
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