The RapidPure POD Purifier Refill Cartridge gives you the power to remove over 99.99% of viruses, bacteria, parasites, and more. This replacement refill cartridge works with the RapidPure Purification Straw, Water Bottle, Insulated Bottle, and Multi-POD System. Each refill cartridge purifies up to 75 gallons of water. As you drink, water is sucked through the the RapidPure dual-action POD system, which filters and purifies your water at the same time. RapidPure has been tested to exceed EPA standards as a purifier, and our dual-action system is 100x more effective at removing virual pathogens when compared to traditional 0.2 micron filters alone.