Abstract: Embodiments of a disposable liner that is disposed in a cavity of a basin are disclosed. In one embodiment, a disposable liner comprises: sidewalls that are design to adapt to the contours of the cavity of the basin; and a bottom wall that is attached to the sidewalls and includes a drainage hole that is aligned with the drainage hole of the basin.

Abstract: Methods are disclosed for making a base of a spa apparatus to resemble artificial rocks and wood. In one embodiment, the method is comprised of the following steps: making a mold in which its inner surface has the shape and surface texture of a rock or wood; placing a first structure on the inner surface of the mold, the first structure being operative to prevent warping of the base; spraying polymer on the mold; allowing the polymer to harden; and removing the hardened polymer from the mold, the hardened polymer having substantially the shape and surface texture of rock or wood.

Abstract: Methods are disclosed for making artificial rocks and wood. In one embodiment, the method is comprised of the following steps: making a mold that has the shape and surface texture of a rock or wood; applying cementitious material within the mold, the cementitious material including acrylic and/or resin-modified cementitious material; applying a hardcoat on the cementitious material; allowing the cementitious material and hardcoat to harden; and removing the mold, the hardened cementitious material and hardcoat having the shape and surface texture of rock or wood.