‘Externally mounted’: Roll up the slatted cover under the protective cover. Make sure the slatted cover is clean and that all leaves and contaminants have been removed. Install a winter pool cover.   ‘Built-in’: If the filter will continue to run, leave the slats on the water. Make sure the slatted cover is clean and that all leaves and contaminants have been removed. Then install a ‘solid weave’ winter pool cover. Do not use a net-type cover. The later type allows sunlight to pass through, which will promote the growth of algae inside the slats during the winter. If the water level is reduced, the filter is protected against freezing. Follow the instructions given above. Remove motors fitted in a motor well and store them in a frost-free location.   With a roll niche behind the pool: The roll niche must be either completely filled with water or completely empty. It must never be half-filled. This results in damage at the frost line. Switch off the power supply to the control box.   ATTENTION: Do not replace or move slats at low temperatures.