I built my house three years ago. The shower has tiled base. Recently the grout surrounding my shower drain has fallen out and it has opened a small crack between shower drain and the tile (images attached). The crack is small 5 cm in length, 0.3 cm wide and 3 cm deep.
Please let me know do I fix it. I have tried filling it with "dunlop ready-to-go grout" twice already. It let it dry for three days but it melted away as soon as I took my first shower.
Kindly guide me how to fix it properly. Really appreciate your help. I would prefer not to hire a titler for such a small job : (
Thanks Waseem