Have a bad smell coming from shower drain. Seems to have gotten worse last couple months.
Water drains well and some water stays in drain as if the p-trap is working.
Tried cleaning drain with brush, baking soda, white vinegar, and very hot water... but did not help.
It is a custom built shower, though I did not see how it was done. It looks like a bottom pan was put in place with some type of marble sides.
Wondering if possibly drain connection is leaking under pan.
House is on a slab, so no easy way to get under pan that I know of.
Hoping someone here can shed some light on what might be wrong and my best options.
I'll include a picture of drain, which to me looks unusual. As if the pipe comes up and drain fits around it, instead of drain fitting into pipe... but I'm not familiar with such.
( it has a snap on chrome cover )
Appreciate any advice.