Backflushing a filter
Overview
Backflushing a filter is the process of running clean water through a water filter in the reverse direction to help remove accumulated particles and restore flow rate.
Key points
- Commonly used with hollow-fiber squeeze or inline filters that slow over time.
- Uses clean water and a compatible device such as a syringe, bottle, or bag according to product guidance.
- Backflushing is a maintenance step and does not replace manufacturer instructions on filter use or lifespan.
Details
Over time, particulate matter in untreated water can clog fine passages in backpacking filters, especially hollow-fiber models. Backflushing involves pushing clean water through the filter in the opposite direction of normal use to dislodge some of this material. Many filters are sold with dedicated backflushing tools and instructions describing how and when to perform the process. The term refers broadly to this maintenance action and does not guarantee that flow rates will fully return to their original level or that a filter will remain effective indefinitely.
Related topics
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