The spa includes: a basin a motor having a shaft, the shaft defining arotation axis a hub mounted tothe shaft, the hub having North and South pole domains spaced apart from eachother and arranged toencircle the rotation axis in alternating relation and an impeller which isdisposed in the basin in axiallyspaced relation to the hub and is at least substantially constrained againstmovement but for rotationabout the axis, the impeller including a rotor body of a non-magnetic,electrically-conductive materialhaving relatively low magnetic permeability. The improvement comprises: lightsand coils coupled tothe impeller for rotation therewith, the lights and coils being coupled andadapted such that, in use, therotating magnetic fields associated with the drive hub created inducedcurrents in the coils whichactuate the lights and create a net force that rotates the impeller.
