The Platypus Gravityworks / MSR Autoflow Replacement Filter Cartridge is effective down to 0.2 microns and meets EPA Guide Standards for the removal of bacteria and protozoa. Approximate filter life of 1500 L depending on quality of water filtered. Filters up to 1.75 liters per minute, no pumping required! Microfilter can be easily backflushed in 4 seconds to maintain filter performance.