de-Fence frameless glass fencing provides a completely transparent wall that is perfect for the pool area and gives a seamless look from the ground up. Glass can be embedded into a concrete channel for a completely frameless look or there is also a system where 12mm glass is bolted onto the side of a concrete wall.   Obviously named "Bolt On Glass".   The glass panel is held in place by the 4,6 or 8 heavy stainless bolts (dependling on the length of the panel). 
Another Frameless Glass Fence system that is very popular is the  stainless steel spigots or clamps that hold the glass panel in place. See our section on "Spigot Glass" for some photos to help you decide.