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Fishy smell in house

Finally we solved our fishy smell problem in a house we were trying to sell!! We thought the smell was always coming from the bathroom & w/come & go. After a contractor checked the traps and told us to run bleach water down all drains it seemed to go away-only to come back. This time he checked the floors and pulled the toilet off. The toilet was not sealed & w/allowed sewer gases to come back up AND the floor was giving away because the toilet was leaking. None of this was found in a professional home inspection. When the floor was pulled there were hundreds of dormat ants that were also giving off a sweet, sickly smell. After flooring was completely redone we thought that was it. A months later a nasty smell came up again. This time we called the furnance maint. person out to check for gas leaks. There was a gas leak just outside the kitchen in another room attached to the hookup to the water heater. After that was fixed no more smells for months so we believe both the areas were the problem alhough the smell wasn't present all the time but would come and go. Hope this helps as it sure took awhile to get to the bottom of our fishy smell and I think we lost a few sales because of it.