This construction is intended specifically for asymmetrical pool shapes. When rolled up, the cover is invisible. There are certain limitations with regard to avoiding coarse contamination and preventing accidents.
| Construction: | Roller system mounted below the bottom of the pool with one shaft and for two covers. With automatic shutter. |
| Installation: | Only for new pools |
| Maximum size: | 25 m x 50 m (larger sizes depending on pool shape) |
| Drive unit in separate motor pit: | Drive unit mounted on the shaft, or chain drive |
| Drive unit without motor pit: | Not recommended |
| Cover slats: | Standard slats 60 mm wide and 14 mm thick |
| Guidelines: | Installation approved only for private pools |