What is the difference between pebble-tech and quartz and wetedge?

There is a web link describing quarts finish below.

There is also a web link on pebble tech below.

pebble tech and quarts are pool surface finishes (see the links mentioned above)

Wet edge is a method of constructing a pool where by one or more edges of the pools side are built just below the waters natural surface height. This brings about a situation where water is constantly falling over the edge of the pool into a balance tank and then via filtration back into the pool.