Good Morning and thank you for visiting our Houzz profile. This is a gunite pool and not a liner. The finish used was Black Galaxy Pebblefina. It is not harder to keep clean than any other color or type of finish. I hope this answer was helpful.

why did you not use a polished finish, what size tiles and how do you get the grout to disapear

Good day and thank you for visiting our Houzz profile. The tiles used were 6" x 12" Black Absolute with a honed finish along with black grout to match the tile. The finish is Black Galaxy Pebblefina. This finish does not get polished it utilizes a specific in water process to expose the aggregate.