This filter cartridge fits the BeFree 3L, 1L, and 0.6L microfilter systems. An exact replacement for the original filter, it can process up to 1000 liters of water. Features: - Replacement filter for BeFree 3, 1, and 0.6 liter bottles - 0.1 micron filter size - Filters up to 1000 liters, depending on water quality