REPLACEMENT CARTRIDGE ONLY, BEFREE AC FILTER SOLD SEPARATELY: The Slate Blue replacement cartridge fits the Katadyn BeFree AC 0.5L and 0.7L Soft Water Filter Bottles in Slate Blue. Restore factory filtration performance. FILTERS SEDIMENT, FINE PARTICLES, AND MICROPLASTICS: 0.1 micron hollow fiber membrane filters out sediment, fine particles, and microplastics from your water sources. Fast 2 L/min flow and up to 1,000L capacity. COLOR-MATCHED SLATE BLUE HOUSING: Designed and styled to match the BeFree AC 0.5L and 0.7L Slate Blue bottles for a clean, coordinated look. Same filtration shipped with your original bottle. EZ-CLEAN MAINTENANCE, DROP-IN INSTALL: Drop into your existing BeFree AC Slate Blue bottle without tools. When flow slows, shake or swish in water to restore flow. No backflushing, no disassembly. BPA-free throughout. TRUSTED SINCE 1928: Katadyn has been delivering clean water solutions for nearly a century. Used by hikers, travelers, and professionals worldwide, our products are built for reliable performance wherever you go.