River stone tile repair

[Sam Bell]

The bathroom shower has river stone tiles with the grout deteriorating and the stones coming out. I live on a remote island and it's almost impossible to get a contractor in to help. Looking for advice on DIY options. Do I remove everything or repair the damaged area? I've uploaded a video of the shower below. Any thoughts, suggestions or guidance would be much appreciated.

 

[One Day]

Hi I watched your video. Sorry to say, but it's basically all failed. Water has got underneath the pebbles, broken down the adhesive and grout along with the wet tray surface. That's why things are coming loose and you're losing grout.
There are no solutions to your problem short of a complete rip out and re-do.
I'm kind of assuming you've got a foam-core wet tray looking at the video, so pebbles are a bad idea on those trays due to point loading, another possible factor in the failing.

 

[Waluigi]

Total guess but looks like a former without weep holes around the where the waste joins the former.

As a repair, I’d look into finding a Hi-Macs/Corian fabricator to put a single piece in.

A customer of mine had this done and the finish was superb.