Waterdrop Gravity Water Filter Straw
- 0.1 um ultrafiltration membrane, 5-stage filtration
- 1,400 gallons (5,300 liters) filter life
- 700 ml/min maximum flow
- 1.5 gallon gravity bag included
- 2 filter straws, 2 water pouches of 16 oz
- 500 ppm maximum TDS supported
- 30 day limited filter warranty
Updated 3 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A two-straw filter kit with a gravity bag for camp and emergency packs, cleared by simple backwashing. The listing names sediment, chlorine and taste reduction but gives no bacteria or virus removal rating.
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ASIN: B09285L8JL
Overview
Waterdrop pairs hollow fiber filter straws with a gravity-fed bag, so water can drip through the filter at camp or be sipped straight from a pouch or bottle. Both ends unscrew to connect to bags and bottles, and a backwash flush clears the membrane.
Long filter life, a gravity bag and a spare straw make the kit useful for a group camp or a home emergency stash. Reduction claims cover sediment, chlorine and odor without naming bacteria, protozoa or virus results, so read the manual before relying on it for backcountry water.
Who it's for
Backpackers filling up at streams and households building an emergency kit get a gravity setup and a sip-through straw in one box. People treating water where viruses are the concern should look for a purifier that lists virus removal.
Pros and cons
- Spare straw in the kit
- Gravity bag frees hands at camp
- Long filter life per straw
- Backwash clears the membrane
- Bacteria and virus ratings not listed
- Short filter warranty
- Backwash needs a supply of clean water
Performance notes
Flow depends on how clean the membrane is and how high the bag hangs, since gravity drives water through the hollow fibers. As sediment builds up the flow drops, and a backwash with clean water pushes trapped particles out. Very cloudy source water clogs the membrane sooner.
Specifications
| Brand | Waterdrop |
|---|---|
| Dimensions & fit | |
| Item Dimensions L X W X H | 10.16"L x 3.39"W x 11"H |
| Capacity & performance | |
| Capacity | 1.5 gallons |
| Maximum Flow Rate | 700 milliliters_per_minute |
| Power & efficiency | |
| Power Source | Non Electric |
| Compatibility & installation | |
| Installation Type | Freestanding |
| Included components | |
| Unit Count | 2 Count |
| Warranty & support | |
| Supported Water TDS Level Maximum PPM | 500 |
| Other details | |
| Container Type | Bag |
| Other Special Features Of The Product | Gravity Water Filter Straw, Water Purifier Survival |
| Purification Method | Hollow Fiber Ultrafiltration Membrane |
Frequently asked questions
How do I clean the Waterdrop filter straw?
Remove the mouthpiece and backwash it with clean water when the flow drops or after long use. A standard water bag, or a pop bottle with a 27.5mm thread diameter filled with clean water, can be used for the backwash.
Does the Waterdrop gravity filter straw remove viruses?
The listing does not claim virus or bacteria removal. It names chlorine, particulates, sediment, stones, sand, dirt, bad taste and odor.
Can the Waterdrop filter straw attach to a water bottle?
Yes. Both ends can be disassembled and connected to water bags or water bottles.