Overflow drain in bathroom floor
I have an overflow drain in the floor of my two bathrooms. The one in our ensuite seems to have an unpleasent odour coming from it. Its not offensive but enough to be distracting. The sink and shower and toilet in the ensuite all flow well. You can see water if you look down the pipe in both bathrooms. I was wondering if it's the smell of stagnent water or if the water should be there at all. The overflow drain in the other bathroom doesn't have the smell but that bathroom isn't used nearly as much. We are on a slab. Hopeing you can help would love to get rid of the smell.