Abstract: A water recreational apparatus has a water basin combination, a cover for covering the water basin combination and a cover removal combination. The cover removal combination includes a cover attachment arm which is rotatably attached to the exterior of the water basin combination. The cover attachment arm is adapted so that the rotation of the cover attachment arm about its attachment axes to the water basin combination alternatively moves the cover between a closed position and an open position. Drive means, such as electric motors, are provided for powering the cover attachment arm about its attachment axes so as to open and close the cover.

Abstract: A centrifugal pump has a pump case and a rotatable impeller disposed within the pump case. A central aperture is defined within the rearward wall of the pump case to facilitate the connection of an impeller drive shaft to the impeller. A drive shaft seal is disposed within the central aperture to seal the impeller drive shaft to the pump case. At least one or more grooves are defined in the rearward wall of the pump case to carry liquids to and from the drive shaft seal. One or more radial ridges are disposed on the rearward side of the impeller to encourage liquids to flow within the grooves to and from the drive shaft seal to continuously wash away precipitates around the seal and to cool the seal.