If you already have a pool, or if you're planning to build one, remember: a pool without a cover is like a house without a roof. Automatic Pool Covers have been proven to be the best way to safeguard friends, family and protect your investment. Alternative Pool Systems (APS) gives you peace of mind with the simple turn of a key. In under a minute your pool is easily covered or uncovered. Your pool cover acts as a horizontal fence for your pool, preventing access by children, pets, and uninvited visitors.