Tier1 PAS-1158 Replacement Pool and Spa Filter fits the Pentair Clean & Clear Plus 320. Tier1 Pool and Spa filters will protect your investment engineered to outperform the competition and exceed your expectations. Features high durability flat bonded filter media that maintains strength even when loaded with sediment. Flat bonded media provides effective filtration across 100% of the media surface compared to point bond media where up to 25% of the filter surface is blocked by the fiber bonds. Supported by a high strength, high flow core to support industry leading flow rates the Tier1 Pool and Spa filters will clean your water faster and more efficiently with less wear and tear on your pump. Dive in with Tier1, the water's great!