Improved performance. The density of the Peak Series LifeStraw filter membranes has been revised for optimized flow rate. This means better performance against sand and silt while maintaining a large flow over a long period of time. This highly versatile filter is interchangeable and has a universal thread to make it as compatible as possible with all your equipment. It is compatible with Peak Series squeeze bottles and gravity water filtration systems or can be used as a standalone straw. Protects against bacteria, parasites, microplastics, mud, sand, and turbidity.