Patent ID: 7293300

Claim:
In combination with a spa with a circulating system and a top rim having an outside and inside edge, the improvement being a waterfall structure comprising: an open water flow channel having a channel floor, side walls, a first end that is closed and a second end that is open, the side walls being longer than the ends, the ends being no longer than the distance between the outside and inside edge of the top rim of the spa, the channel being embedded in the top rim of the spa with the side walls of the water flow channel being between the outside and inside edge of the top rim of the spa, and the second open end of the water flow channel located at the inside edge of the top rim of the spa; and a water access apeture in the channel floor of the open water flow channel at the closed end, allowing water to flow into the channel, at the closed end, and along the channel to the open end, spilling over the inside edge of the top rim into the spa.