Here is a simple way to determine what type of pool lining you have…
A marbelite pool has a gunite or marbelite lining on top of its concrete shell. The lining is porous and rough to the touch.
A fibreglass lining can be applied to previously gunite or marbelite pools, or exists in premoulded factory build pools. The lining is less porous than on a marbelite and is smooth to the touch.
Vinyl pool linings are plastic.
Chip tile pool linings are similar to marbelite pools in nature but are decorated with tiles.