Ideal for use before Camelbak"s All Clear Purifier portable water purification system, the Camelbak All Clear Pre-Filter strains out larger sediment particles prior to purification, so you can hydrate with clean, debris-free water while hiking, backpacking or traveling the world. Plus, the frame mounts securely over the bottle threads and helps to protect them from untreated water when dunking t into rivers and streams, so you can drink responsibly.