The durable steel frame is equipped with our Seal & Lock System for a sturdy and secure pipe connection. The frame connectors also prevent metal-on-metal contact to ensure corrosion and rust resistance. 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. Additional Features: This above ground pool set also comes stocked with a filter pump and a ChemConnect chemical dispenser. The ChemConnect dispenser maintains clean, healthy pool water by providing a stable level of chlorine that is evenly dispersed throughout the pool.