Membrane Solutions Gravity Water Filter Pro 6L with Extra WS02 Straw

In this review of the Membrane Solutions Gravity Water Filter Pro 6L the bottom line is straightforward: this is a practical, group-oriented water filter for camping, hiking, and emergency use that prioritizes capacity and reliable filtration. The reviewer found the single biggest reason to buy is the extra-large 6L reservoir paired with a 0.1-micron hollow fiber membrane that filters up to 5,000 liters, making it ideal for small groups who need repeated access to safe drinking water without constant maintenance.

Key Features

• Extra-Large Capacity: The 6L reservoir supplies enough treated water for a small group, reducing trips to the stream and the need to constantly refill.
• 4-Stage Filtration: The combination of 0.1-micron hollow fiber ultrafiltration, coconut shell GAC and dual PP fiber filters reduces bacteria and improves taste for safer drinking water.
• High Filtration Volume: The system is rated to filter up to 5,000 liters of outdoor water before replacement is required, making it useful across many trips.
• Superior Backwash Solution: The detachable mouthpiece connects to a common bottle for simple backwashing so cleaning is tool-free and lightweight.
• Versatile Use: The components can be used as a gravity system, as a direct water filter straw, or connected to bottles and an extension tube for flexible field use.
• Easy Hanging: An adjustable tree strap fits trunks from 22.5 in to 41.5 in for convenient suspension over a camp site.

Who It's For

The Membrane Solutions Gravity Water Filter Pro 6L is best for campers, backpacking groups, and small families who need a high-capacity, low-effort source of potable water at base camp or during multi-day outings. It suits users who value simple maintenance and the ability to filter larger volumes without carrying many spare filters.

Less suited are solo ultralight hikers who prioritize minimal weight and pack bulk, and anyone who needs instant pressurized flow for cooking or dish washing; this is a gravity system designed for drinking water and camp use rather than indoor plumbing replacement.

Pros & Cons

Pros

• Large 6L reservoir provides sustained access to treated water for groups without frequent refills.
• Effective multi-stage filtration (0.1-micron hollow fiber plus GAC and PP) that reduces bacteria and improves taste.
• Backwash via common bottle makes field maintenance simple and tool-free.
• Flexible use modes allow straw, bottle connection, or gravity setup for varied situations.

Cons

• Gravity flow can be slower than pump systems and depends on elevation for fastest output.
• At 6L the reservoir is bulkier than single-person filters, which may be excessive for ultralight day hikes.

Specifications

Brand	Membrane Solutions
Model	Gravity Water Filter Pro 6L
Capacity	6L
Filtration Stages	0.1-micron hollow fiber, coconut shell GAC, double PP fiber
Rated Volume	Filters up to 5,000 liters
Backwash	Detachable mouthpiece connects to common bottle
Tree Strap Length	22.5 in minimum to 41.5 in maximum

Our Verdict

The Membrane Solutions Gravity Water Filter Pro 6L is a smart buy for groups and base camp users who want reliable, large-volume filtration without complex tools. Its multi-stage 0.1-micron membrane and easy backwash make it good value for repeated trips, while the versatile straw and bottle connections add practical flexibility for varied outdoor setups.

Frequently Asked Questions

How much water can the filter treat before replacement?
The system is rated to filter up to 5,000 liters of outdoor water under normal use.

Can the system be cleaned in the field?
Yes, the detachable mouthpiece connects to a common bottle for backwashing so you can flush the membrane without extra tools.

Is this suitable for solo ultralight hikers?
It is functional for any user but the 6L reservoir adds bulk, so ultralight hikers may prefer a smaller straw-style filter.