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Welcome to Just Answer, I will do my best to help with your problem
Since you had the line snaked out the pumice stone is probably mostly gone and shouldn;t be a cause for concern
You could try flushing some lime down the drain to neutralize the liquid plumr.
To do this fill the sink with the hot water then slowly add lime to the water mixing it so it dissolves. Stop adding lime when it no longer dissolves. Then let the water out of the drain. You may have to do this several times
If the odor persists after treating the drain with the neutralizing lime solution you could try dumping one of the commercial odor killers we use down the drain
Odorgone and SweetAir are to brands we use. You should use the liquid version
Thanks Rick. Since I'm a renter I'm more inclined to have a professional take care of this. I'm just hoping that there hasn't been any damage done to the drain pipe as a result of the Liquid Plumr being there for such a long time. Wondering if you have any insight on this?
Liquid plumr won't (or shouldn't) harm the pipes.
We use much harsher drain cleaners and they don't harm the pipes
Ok, thanks. I feel relieved about that. I'll try to have a professional take care of this. Thanks for your help.