sounds like you need to snake it clear or use liquid plumber which most plumbers do not recomend- there must be some debris trapped- after it's cleared use some soap to rinse it clean so there is not a smell lingering
It will kill the larvae but the important thing to remember is they only breed in stagnant water. Make sure water at water line is fresh and if it's a floor sink clean it and run drain basket through dishwasher. if pipe above water line has build up, knock it off with a drain brush.
A floor drain , drains water and other liquids that spilled on the floor
The drain from the washer to the main line is getting plugged and the floor drain is easier. Drain cleaner in the floor drain should take care of it.
I would say that if water had never backed up in your floor drain, then backed up even after you had the drain line snaked, Roto-Rooter didn't do their job. Once a drain line is cleaned, it should drain like it did before the stoppage. As for plugging the floor drain, it is there for a reason, I would not plug it. There are several items manufactured that will allow a floor drain to drain but if the line starts stopping up they will seal the drain off to prevent water from coming out of the drain.
Yes, be sure to pipe floor drain line properly into water closet piping.
You should install a drain to prevent stagnant water from accumulating and hopefully prevent bacteria such as legionnaire or other water borne diseases and most importantly this drain should empty as an indirect waste as per modern codes
Not much other than the floor slopes into a flor drain so any water or other fluid goes directly into it while a floor sink is bigger, sometimes has a strainer in it but pipes can be ended directly above floor sinks so that the fluid from the pipe flows pirectly into it
The main drain is plugged. Not completely, but enough that it is easier for the upstairs water to come out in the shower and floor drain instead of going out the drain.
The difference between a gully trap drain and a floor drain is placement. A floor drain is in a floor, a gully trap drain goes on an external wall.
Washing machine drains into a floor drain? The drain need cleaning. Liquid drain cleaner may do it, or it may need to be snaked. Simple fix is to get a 30 gallon trash can, cut a small hole in the bottom, the size of a quarter and set it over the drain. Let the washer drain into that. The small hole will let the water drain at a rate that the floor drain can handle it.
The evaporator drain allows condensation from the ac unit to drain. When the drain clogs up water will go into the passenger floor instead.
No.