Blu NMC Refill Cartridges are replacement filters designed for ionic shower filtration systems. This 3-piece value pack features an improved formula that effectively removes harmful pollutants from shower water, helping to provide cleaner and healthier water for your daily shower. These cartridges are specifically designed for use with Blu ionic shower filter handhelds. Each pack contains 3 replacement cartridges with an improved filtration formula. The cartridges utilize NMC (Negative Metal Ions) technology to help remove contaminants and harmful pollutants from your shower water. For optimal performance, cartridges should be replaced according to manufacturer recommendations.