I need to do the whole terrace, 50m2 or so, so manually isn't ideal. I'll try my grinder and disc and if not good will get a tool of sorts.
Shit a brick! I didn’t think we were talking that big. Even if a few more tiles are blown regrouting looks the best. Possibly a diamond disc run down the centre of the grout line and then knock the rest into the grove with a chisel/bolster?
That's actually the only bad tile, I just has that photo on my phone. Was really to show grout width. Yeah that's a good idea.
@Chaley started
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I need to do the whole terrace, 50m2 or so, so manually isn't ideal.
I'll try my grinder and disc and if not good will get a tool of sorts.