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I took delivery of a Grandee with the ACE system about 1 month ago. We use the tub 4 - 5 nights a week with my family of 4. I have it set on the highest usage level and so far, the ACE system only keeps the tub at 1 PPM chlorine. I've called the dealer several times and have been given different advice based on who I speak to. I started with 3 cups of salt and am now at 5.5 cups....the max. recommended is 6. Overall, I am very happy with the tub but I'm concerned that the ACE system can't keep up. I've tried to get the dealer to come look at it to see if something is wrong but they keep saying "try this....and call me tomorrow". I cannot help but think that there is something wrong with my particular unit.The latest that I was told today is to shock the tub with chlorine to "jump start" the system. I'm definitely starting to lose my patience for a $11.7K tub.....