As it’s an exterior balcony could the builder have used a harder grout?

Both portions both solid and damaged are giving me difficulty. I’ve only just stated using the blade, maybe 20 minutes trying different areas but it’s ...

Got the multi tool and POW fit as recommended. Started grinding and the old grout is like concrete. Hardly making a dent on it

Hi, I’ve decided to regrout and reseal our outdoors balcony due to loose grout and effervescent. I would like some advise on how to get started and pr ...