Hi Sidney, This is a type of slate which you can purchase from Eco Outdoor. Depending on where you are there is a showroom in each state. I'd highly recommend on visiting a showroom or even having a look at their website www.ecooutdoor.com.au
Ideas for new finishes around our pool area
Tiled swimming pool: waterline detailing or not?
Just asking around - old children's swimming pool
Need help with pool fence!!