The 15' x 33" Inflatable Above Ground Swimming Pool by Bestway is a great swimming pool. It sets up in only a matter of minutes on a flat surface as only the top ring needs to be inflated; the body of the pool has a liner that lifts when you fill the pool with water. The set includes a 530-gallon filter pump and filter cartridge to keep the water fresh and clean. It also comes with a flow control drain valve, allowing it to be drained quickly at the end of the season. The Fast Set Pool is constructed of tough Tritech material, making it extremely durable and guarantees to keep for years to come! Have fun all summer with the Bestway 15' x 33" Inflatable Above Ground Swimming Pool.