Just a thought on salt water systems. I worked as a Structural Maintenance/Corrosion control specialist for 10 years and as a rule salt water + anything equaled corrosion eventually. My wife and I Wet tested just about every spa that you did and we decided on the Sundance Altamar. We have had our spa for 3 months now and LOVE it. The reason we picked Sundance was the filtration system, individual jet control and the wet test. Our second choice was the Arctic Klondiker the reason we did not chose Arctic was that we had the salesmen pull off the panels and turn on the jets when I saw how the piping moved each time the jets were turned on. I decided against Arctic. The mechanic in me said problems down the road with things coming loose