18 x Aqua Optima Water Filters Cartridges Evolve+ Brita (18 months supply) are essential for keeping your household water clean and fresh. Made of durable plastic, these cartridges use a 5-stage filtration method with carbon/charcoal to effectively remove chemicals and contaminants. With a brand name of Aqua Optima and compatibility with Brita Jugs, these white cartridges are perfect for providing clean water for your family. Made in the United Kingdom, these cartridges offer a convenient 18 months supply, ensuring you have clean water for an extended period of time.