Filtering water is the main job. Carrying, connecting and caring for the filter are part of the experience, too.
DualFlow brings those tasks into one 64 g body. The three-stage water path deals with different filtering jobs, two inlet thread sizes accommodate different containers, and the backwash connection stays with the filter.
01 / FILTER
Give each layer a clear role.
A coarse screen protects the membrane; carbon adds a finishing stage.
02 / CONNECT
Work with different routines.
Support a bottle on the move and a hanging water bag at camp.
03 / MAINTAIN
Make care part of the object.
Build in the backwash port, so maintenance needs one less loose part.
01 / THE STARTING POINT
Fine filtration. Practical flow.
SQUEEZE FILTRATION / FLOW DEMONSTRATION
UP TO2L/min
A pore size is only part of the story.
A filter also has to be practical to use. DualFlow pairs a 0.1 μm hollow-fiber membrane with a rated flow of up to 2 L/min, using pressure from a gentle squeeze or the height of a hanging water bag.
Maximum rated flow. Actual flow varies with water quality, pressure and filter condition.
02 / FOLLOW THE WATER
Three stages. Three different jobs.
The design separates sediment screening, membrane filtration and taste improvement into three successive stages.
1 Pre-filter→2 Membrane→3 Carbon
STAGE 01 / THE FIRST LINE
Protect the membrane before water reaches it.
The first stage is a 304 stainless-steel screen. It catches sand, sediment and larger debris upstream of the membrane, reducing the amount of coarse material that reaches the finer filtering surface.
Start with the clearest flowing freshwater available. The pre-filter is extra protection when a little sediment comes along.
Two different cleaning jobs
The video shows loose sediment being cleared by inverting and shaking the pre-filter area. Membrane backwashing is a separate step: clean water travels through the filter in reverse.
01 / STAINLESS-STEEL PRE-FILTER
STAGE 02 / AT THE HEART OF DUALFLOW
A physical barrier at the core.
Water passes through the walls of the PES hollow fibers. The 0.1 μm pores create the physical filtration barrier; this stage handles the fine particles and bacteria that the coarse pre-filter does not.
0.1μm
PES HOLLOW-FIBER MEMBRANE
A closer look at the filter body and outlet assembly.
99.9999%
Total coliform removal
Measured at start-up in the SGS laboratory test. Result applies to the tested sample and stated test conditions.
The factory process uses airborne particles to check filter integrity. This screens for an unintended path through the assembly; it is a separate check from the SGS water-filtration test.
03 / SILVER-LOADED ACTIVATED CARBON
STAGE 03 / THE FINISHING TOUCH
Why add carbon after the membrane?
Particle filtration and taste are different design problems. After the membrane, water passes through a silver-loaded microporous activated-carbon capsule that helps reduce unwanted odors and off-tastes.
What does the silver-loaded media add?
The product uses Ag₄O₄ within the carbon media to help inhibit bacterial growth in that stage. Its role is different from the membrane’s physical barrier. It does not turn the filter into a universal treatment for every water source.
Antibacterial ABS is used for the housing. High-frequency welding joins the filter body and 42 mm connection to help improve leak resistance. These construction choices support the filtering system; they do not replace its three stages.
03 / DESIGNING AROUND THE CONTAINER
Why two thread sizes?
Bottles and water bags serve different routines. DualFlow accommodates both with 28 mm and 42 mm connections.
THE EVERYDAY TRAIL SETUP
28mm
One opening. More than one container.
The 28 mm inlet fits compatible beverage bottles and the optional RidgeSong 2 L water bag. Container shape and thread size are separate choices: the same connection can serve a bottle or a bag.
28 MM BOTTLES + COMPATIBLE BAG OUTLETS
Check thread compatibility and the seal before your trip. The 2 L water bag is an optional accessory.
THE DESIGN IN USE
From the filter. To your cup.
A closer look at DualFlow in the mountains. Squeeze the source container to move water through the filter and into a separate vessel.
AN ALPINE REFILL / DETAIL
04 / MAINTENANCE IS PART OF THE SYSTEM
The backwash connection belongs in the filter.
Fine particles can build up at the membrane and reduce flow. Backwashing reverses the direction of clean water to help lift trapped debris. Building the 28 mm backwash port into DualFlow removes the need to carry a separate connection adapter.
01
Expose the backwash port.
Unscrew the drinking-outlet assembly to reveal the built-in 28 mm connection. The carbon capsule stays with the removed assembly.
02
Connect clean water.
Attach a compatible 28 mm bottle filled with clean water.
03
Flush in reverse.
Gently squeeze clean water through the outlet side of the membrane and out through the inlet. Refit the outlet assembly before filtering again.
FILTERING
Source water → Screen → Membrane → Carbon → Outlet
BACKWASHING
Clean water → Backwash port → Membrane in reverse → Inlet
5L
Make it a habit. Backflush after every 5 L, or when flow slows.
CLEAN WATER IN. TRAPPED DEBRIS OUT.
THE DESIGN, TAKEN TOGETHER
One small system. Considered from end to end.
Screen the sediment. Filter through the membrane. Finish with carbon. Connect. Use. Backwash.
The intended use matters as much as the components inside.
What water sources should I choose?+
Use the clearest flowing freshwater available. Avoid industrial runoff, wastewater and visibly contaminated water. DualFlow provides filtration; follow appropriate water-treatment guidance when the source is uncertain.
Does it remove viruses or salt?+
No. DualFlow is not a desalinator and is not designed to remove viruses or all dissolved chemical contaminants. The carbon stage is not a claim that any water source can be made suitable for drinking.
Will it work with my bottle or water bag?+
DualFlow supports compatible 28 mm and 42 mm container openings. The 28 mm connection works with common beverage bottles and the optional RidgeSong 2 L bag; the 42 mm connection accommodates compatible wide-mouth containers. Check the thread fit and seal before use.
How often should I backflush?+
Backflush with clean water after every 5 L of filtration, or when you notice reduced flow. Use the built-in 28 mm backwash connection and follow the product’s care instructions.
What does the SGS result tell me?+
The report records 99.9999% total coliform removal at the start of service life for the tested sample. It does not establish removal of every contaminant or guarantee the same result for every field condition. Read the test report.
THE EVERYDAY TRAIL SETUP
