LifeStraw Peak Series Membrane Microfilter ReplacementLifeStraw’s Peak Series filter membrane density has been re-engineered for optimized flow rate - meaning better performance against sand and silt while maintaining great flow for the long haul. This highly versatile filter is designed to be interchangeable, featuring universal threading to make it as adaptable as possible to all your gear. Protects against bacteria, parasites, microplastics, silt, sand, and cloudinessEnhanced microfilter performance: Our re-engineered membrane and custom backwash accessory means better performance against sand and silt, maintaining great flow over the long haulUltra-compact, our reconfigured filter is tiny but mighty and doesn’t sacrifice weight or spaceCompatible with the Peak Series collapsible squeeze systems, gravity water filter systems or use as a standalone straw