Minn. R. 4717.1575
POOL COVERS
If a pool cover is used, any new cover must comply with ASTM Standard F1346-91. A. Pool covers must be maintained in a clean and sanitary condition to preclude contamination of the pool water. B. If the deck area is accessible when the cover is in place, a fully secured safety cover must be used. C. A pool cover may not be used in lieu of a fence or other access restrictions required by part 4717.1550 .