You must backflush regularly to maintain optimal performance of the filter cartridge. This is especially true in murky or very silty water. Since hollow fiber is not a depth-based media like ceramics, you don’t clean by removing clogged material from the exterior of the filter media. Instead, you must rinse the particulate that collects on the outside of the Hollow Fiber membranes. Infrequent backflushing makes the particulate harder to remove and more difficult to restore the media’s flow capacity. We recommend backflushing anywhere from every 8 liters to after each use, depending on water quality. The more you backflush, the better your flow performance and the longer life you can expect from your filter cartridge.