This is a smart way of replacing that broken glass top.
Using a concrete slab
and give it that tough rustic look.
So good for outdoors.
It should tolerate all weather conditions.
But should algae grows..
Simply wash it with bleach and it will be as new again.
I have always kept my patios and garden walk-ways free from algae using bleach.
Bleach can be hazardous, so make sure your pets don't come in contact.
Rinse thoroughly and use with care.