Aqua Optima Evolve 60 Day Water Filter 4 pack = 8 months' supply. Also fits Mavea. Fits Aqua Optima, Mavea and Bosch Tassimo Reduces chlorine and limescale by up to 80%. Also reduces herbicides, pesticides, lead and other heavy metals. Each filter lasts for 60 days / 50 gallons 4x Aqua Optima Evolve 60-day filters = 8 months' supply All Aqua Optima products are BPA free