Abstract: A rolling cover for a spa or a pool, which can be a rolled-up into generally cylindrical configuration, and an unrolled into a generally flat configuration. The rolling cover includes a flexible top cover, a flexible sealed insulation bag, a bag support structure, a top cover support structure and a cover tightening arrangement. Further, a spa including the rolling cover.

Abstract: A filter assembly for filtering water in spas, swimming pools, hot tubs and whirlpools, having a first or outer filter element, a second or inner filter element removably installed within the outer filter element, a first coupling member associated with the outer filter element, a second coupling member associated with the inner filter element, the first and second coupling members engaging one another to connect the inner filter element with the outer filter element, and a releasable detent arrangement resisting disengagement of the first and second coupling members from one another. The outer filter element includes a filter medium for mechanically removing particulates from a fluid to be treated and the inner filter element includes a filter medium containing fluid purifying particles.

Abstract: A rolling cover for a spa or a pool, which can be a rolled-up into generally cylindrical configuration, and an unrolled into a generally flat configuration. The rolling cover includes a flexible top cover, a flexible sealed insulation bag, a bag support structure, a top cover support structure and a cover tightening arrangement. Further, a spa including the rolling cover.

Abstract: A lighting system includes a substrate of non-absorbent foam material having a first surface, an undercut groove formed in the first surface, and a light source disposed in the undercut groove. The lighting system can be used with various structures including, but not limited to spas, swimming pools, decks, marine products, and sheds.