Check the listing for details. Yard Guard Deck-Lock System 18' x 36' Rectangular Green Mesh Safety Cover. Condition: New. Listed at 549.99 USD. Yard Guard® Deck-Lock System 18' x 36' Rectangular Green Mesh Safety Cover Item Number: 451836 Item Features The Yard Guard® Deck-Lock System is a high-quality mesh cover with reinforced webbing and blocks 90% of sunlight from passing through the cover. The material is made of porous tight mesh for maximum strength; reinforced webbing creates a secure perimeter around the edges of your pool. This safety cover is for an 18' x 36' pool but the actual cover measures 20’ x 38'. The additional 2 ft. overlap on each side provides extra material to securely anchor the safety cover to your deck or surrounding perimeter. Features: Actual cover size 20’ x 38' (2 ft. overlap on each side) Provides 90% sunlight blockage to eliminate algae growth in your pool Meets or exceeds all industry safety cover performance standards as set forth in ASTM F 1346-91 Benefits: Mesh Material: The mesh material prevents debris from entering the pool while allowing water to pass through the mesh cover. Clear Water: The cover prevents 90% of sunlight from entering your pool creating clearer water with less algae. Warranty: 12 year limited warranty Note: For this safety cover to work properly, your pool must have 3’ or more of concrete around the perimeter, there must not be any protrusions from the deck within 12” of the edge of the pool (such as slide or diving board mounting brackets, hand rails, ladders, etc.), and the pool must be the exact size (within 3") and shape specified by the product description (including size and position of steps and no more than a 2’ radius at the corners) for any product warranties to apply.