• For those looking for a longer lasting, easy to operate swim spa cover then consider the Smartop Swim Spa which can be ordered for swim spas up to 20′ long. The Smartop Swim Spa is available in two versions. The Smartop Upright for Swim Spas or the Smartop Vanish for Swim Spas. The “Upright” model holds the covers up higher to create privacy and requires less clearance on the end of the swim spas. The “Vanish” drops the cover down on the ends of the swim spa creating better visibility for swimmers.