How to Use a Gravity Filter with a Seeker+ 6L

By HydraPak | Performance Hydration Reservoirs, Soft Flasks ... | Published: 2026-10-19

Category: How-to Guides

Learn the step-by-step process for setting up and using the Seeker+ 6L Gravity Filter Kit to purify backcountry water safely and efficiently.

Quick answer

To use the Seeker+ 6L Gravity Filter Kit, fill the dirty bag, hang it above the clean bag, and let gravity pull water through the filter. Always keep the dirty bag elevated and the clean bag lower to maintain flow.

Why gravity filtration is a smart choice for camp

Gravity filters let you treat water while you set up camp or cook, without pumping or squeezing. Once the system is hung, it works on its own, which is a major time-saver after a long day on the trail.

The Seeker+ 6L kit includes both a dirty bag for collecting raw water and a clean bag for storing filtered water. This separation is key: it prevents cross-contamination and lets you treat a large volume in one go.

Know the trade-offs before you go

Gravity systems are heavier and bulkier than a squeeze filter, and they need a place to hang. If you are moving fast and light, a bottle filter might be a better fit. But for basecamp or group trips, the convenience of hands-free filtration is hard to beat.

Also, the filter only removes what it is rated for. The Seeker+ 6L filter removes bacteria, protozoa, and cysts, but it does not remove viruses or dissolved chemicals. For water with suspected viral contamination or chemical pollution, use additional treatment like boiling or UV.

Step-by-step gravity filter setup

Find a suitable water source: Look for clear, moving water when possible. Avoid stagnant pools or water with obvious algae. Use the wide-mouth opening of the dirty bag to scoop or dip water, taking care not to disturb sediment at the bottom. Check for debris before filling; the pre-filter handles small particles, but large chunks can clog the system faster.
Attach the filter cap to the dirty bag: Screw the 63mm Plug-N-Play filter cap onto the dirty bag until it is snug. Make sure the O-ring is seated properly to prevent leaks. This cap contains the filter element and connects to the clean bag. A loose cap is a common cause of drips; always hand-tighten and check the seal before hanging.
Connect the clean bag: Attach the clean bag to the filter cap outlet. Ensure the connection is secure so no unfiltered water can bypass the filter. The clean bag is where the filtered water will collect. Verify both connections are tight before you hang the system to avoid spills and contamination.
Hang the dirty bag above the clean bag: Find a sturdy branch, rock, or trekking pole to hang the dirty bag. The clean bag should rest on the ground or a low surface. Gravity creates the pressure that pushes water through the filter. The higher the dirty bag, the faster the flow. Aim for at least 1-2 feet of elevation difference; if flow slows, check for kinks in the hose or a clogged pre-filter.
Let gravity do the work: Open the flow valve on the filter cap to start filtration. Water will pass through the filter and into the clean bag. This can take several minutes for the full 6 liters. Use this time to set up camp or cook. Do not force the flow by squeezing the bags; this can damage the filter. Patience is key.
Store and clean the system properly: Once filtration is complete, close the valve and disconnect the bags. Empty any remaining water and allow the system to air dry. Store the filter in a cool, dry place. Backflush or clean the pre-filter according to the manufacturer's instructions to maintain performance. Never leave the filter wet for long periods, as this can promote mold growth. Dry it thoroughly before storage.

The gear that makes it work

Seeker+™ 6L Gravity Filter Kit: The Seeker+ 6L Gravity Filter Kit features a wide-mouth dirty bag for easy filling from shallow or slow-moving water, plus an integrated pre-filter that blocks debris and extends filter life. This means you can collect water from sources that would clog other filters, and you will not have to clean the main filter as often.
Seeker+™ 6L Gravity Filter Kit