Easiest set up on the market, robust and durable 100% PVC heavy duty vinyl walls and thick floor, quick drain valve. Supporting swimming pools with no complicated construction or tubular frames - just inflate the top ring of the two, and the pool is ready to be filled with water. As the water fills, the upper ring will float on the water forming the rigid sides in approx 30 minutes The pools feature an adaptor for connecting a filter pump (recommended) or garden hose to connect your water source and fill the pool to the required capacity. This should be around 80% of the depth to ensure the side floats to form the rigid walls, and for the most fun!