Bar/ Sink Pump

Hi people,
I recently moved into my house that has a BAR/SINK pump in the basement. The brand of the pump I believe is Flotec 1/4 Horsepower Sink Pump System. It sits below the sink of my basement wet bar and every once in awhile there is a pretty bad odor coming under the sink. I believe it's coming from the sink pump system, and if I pour some hand soup down the drain and let the water run, after a few pumps the smell would go away but will return in a few days again..........
Does anyone know how to remove the smell? I am thinking of dumping DRANO or BLEACH in there but want to check with you guys first. I did a search online and had no luck. I don't believe it's a good idea to dump bleach or drano into a sink pump... I was also thinking of pouring some vinegar in there ( works with garbage disposal.)

what are your thoughts of getting rid of the smell?

You should have an enclosed pump system.
One line going out for the waste, and one for the vent.

If you have an open reservoir, it's going to smell between uses.

yes you are correct. However, can I pour bleach or drano into the closed system?

But if you smell it, its not a closed system. Do you have a functioning automatic vent on the unit? A little bleach for a flush would not hurt.

This is the exact unit I have... black and 1/4 HP
http://www.pumpagents.com/store/products/FlotecPumps/fp0s1800lts.jpg


I thought it was a closed system. I am tempted to pour some drano in there but afraid it might do the pump inside some damage.....

so is it ok to pour bleach down?

No drano unless you want a new system. Mild bleach solution and find out where the leak is.

I treat a lot of pump systems with Bio-Clean

It's better for the pipes, and longer lasting.
It cleans more of the pipe, all the way around.