Polaris NATURE2 W28175 Express Above/InGround Vessel Pool Mineral Sanitizer Cartridge

New Nature2 Express cartridge for up to 25,000 Gallons. For Inground or Aboveground Swimming Pools. Reduces eye and skin irritation. Easy to replace cartridge. Destroys bacteria. Capacity: 5,000 25,000 Gallons Pools. Cartridge lasts 6 months. Run Time: 6 Hours a day minimum. Cleaner, clearer, softer water with less chlorine.