Spend your summer days staying refreshed and cool while having fun with the family in the Bestway Power Steel 18' x 48 inch Above Ground Pool. Easy to set up, the Bestway Power Steel Pool is built to last. The durable, corrosion-resistant steel frame is equipped with our Seal & Lock System for a sturdy and secure frame connection. Protective connectors help prevent damage and rust-causing metal-on-metal contact. The sturdy Tritech liner is made out of an ultra-durable 3-layer material that is reinforced for strength and puncture-resistance. Tritech is 15% more tear resistant, 33% more stretch resistant and 83% more puncture resistant than standard PVC, ensuring your pool will lastsummer after summer. The powerful sand pump lasts longer, is more environmentally-friendly and requires less maintenance than a traditional filter cartridge pump. With a pre-filter strainer basket to catch larger items, this pump is highly-efficient and lasts for many seasons to come. The sand filter pump uses either silica sand or lightweight Bestway Polysphere Pool Filtration Balls, included in this set. Made of recyclable and non-toxic material, the cotton-like filtration balls can last 4-6 months with proper maintenance.