Grid-Down Water Filter
Up to 65% off this season
Secure my waterWhen the grid goes down, your tap goes with it. This filter makes any fresh water safe to drink, with no power at all.
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Free with every order: Grid-Down Water Protocol e-book and 16 prep checklists $33
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The one thing standing between your family and the next outage. The human body can go three weeks without food. Without water, three days. When the grid goes down, municipal pumps lose pressure within hours, boil-water notices follow, and bottled water is the first thing to leave the shelves.
When everything fails, this works. No power, no batteries, no chemicals. Put the lower end in any fresh water source, drink through it, or fill a bottle. A hollow-fiber membrane and an activated carbon stage do the work.
Built for the moments that matter. 3.5 oz, small enough for a glovebox, up to 130 gallons per filter, stored dry it keeps for years. One per person, one for the vehicle.
1× Grid-Down Water Filter with cap and strap · printed quick-start card · Grid-Down Water Protocol (e-book, by e-mail) · 16 Emergency Prep Checklists (PDF, by e-mail).
Every order ships tracked, and your tracking link comes by email. Delivery options, times and costs are shown at checkout before you pay. Full details are in our Shipping policy.
60-day money-back guarantee. Not what you expected? Send it back, we refund the order. If a filter ever fails to perform as described, we replace it.
Grid-Down Water Filter
Up to 4 filters free + free guides
Manufacturer figures. Independent lab report to be published on our Lab Report page.
Everything you need for safe drinking water when the grid goes down, in 3.5 oz.
Boil-water notice? Pressure gone? Put the filter in any fresh water and drink. No waiting, no boiling, no power.
A hollow-fiber membrane physically blocks bacteria and protozoa. An activated carbon stage reduces chlorine taste and odor. Nothing to charge, nothing to dose.
At 3.5 oz it weighs less than your phone. Drink straight through it or thread it onto a standard bottle. If you have to leave home, your water plan leaves with you.
Each filter handles up to 130 gallons, about six months of drinking water for one adult. That is why families keep one per person, plus one for the car.
Most homes have three bottles. A family of four needs twelve gallons for three days. That is the math: one gallon per person per day (Ready.gov).
Grid down. Pumps switch to backup, if any.
Backup fuel runs low at smaller stations.
Pressure drops. Boil-water notices go out.
Bottled water sold out locally.
Stored water gone in most homes.
Both events are documented in public reports. Scene images on this site are labeled as dramatizations.
Four stages, zero power.
Put the lower end into any fresh water: creek, rain barrel, pool, a tap under a boil-water notice. Drink through the mouthpiece or fill a bottle.
Water passes through a bundle of hollow fibers with pores far smaller than bacteria and protozoa. Sediment and microplastics stay outside.
An activated carbon block reduces chlorine taste and odor.
No waiting, no charging, nothing to replace for up to 130 gallons. Blow back through it after use, let it dry, store it.
Pore size, flow rate and capacity are stated from the lab report once published. Not for viruses, chemicals or salt water.
E. coli, Salmonella, Vibrio cholerae, Shigella, Campylobacter. Why it matters: after floods and sewer backups these are the first contaminants in municipal water, and the reason boil-water notices go out.
Giardia, Cryptosporidium. Why it matters: chlorine does not kill Cryptosporidium reliably. Filtration does.
Fibers and fragments down to the membrane's pore size. Why it matters: they are now found in most surface water and many tap samples.
Sand, rust, organic matter, cloudiness. Why it matters: murky water is what you get from a rain barrel, a pool or a creek after a storm.
Reduced by the activated carbon stage. Why it matters: kids drink what tastes normal.
Straight answer
Every filter straw has limits. Most brands leave them off the box. Here are ours.
What it does
What it does not do
Know your gear's limits before you need it. Layered with tablets for viruses, it covers what most boil-water notices are about.
Tool · how long one filter lasts
Each filter handles up to 130 gallons. At one gallon a day, that is roughly six months for one person. That is why we say one per person, plus one for the car. Tell us your household and we'll show what you'd otherwise need to store.
Basis: 1 gallon per person per day (Ready.gov). Filter capacity varies with water quality.
Recommended for your home
Family
Three ways to have drinking water when the tap stops. Only one of them fits in a drawer.
| Stormward filter | Stored bottles | Boiling | |
|---|---|---|---|
| Needs power | No | No | Yes, stove or fuel |
| Space for 72 h, family of 4 | Fits in a drawer | 12 gallons, about 100 lb | Pot, fuel and a working stove |
| Works on creek, pool, rain water | Yes | No | Yes, if you can boil it |
| Available during the outage | Yes, if it is on the shelf | Only what you stored | Only while fuel lasts |
| Works in the car | Yes | Heavy | No |
| Runs out | After up to 130 gallons | After the last bottle | With the fuel |
Storage math: 1 gallon per person per day (Ready.gov). 12 gallons weigh about 100 lb.
Verified buyers of this filter.
I find the water filter practical and efficient. Clear recommendation.
Silvia R. · Dec 2025
Very fast delivery. Easy to use. Thank you, we will gladly buy again when needed.
Gabriela H. · Dec 2025
A great alternative to the bottle!
Pia M. · Jan 2026
Delivered quickly. Light and handy filter. The trip we wanted to use it on was postponed, so it has not been used yet and I cannot say much more.
Bärbel H. · Mar 2026
Everything top.
Markus W. · Mar 2026
All good.
Anton K. · Aug 2026
Verified reviews of this filter.
5.0 / 5 · 6 reviews from verified buyers
Order, store it, test it on your tap. If it is not what you expected, send it back within 60 days and we refund the order. If a filter ever fails to perform as described, we replace it.
Total value $473.00
Today $150.00
Family + parents bundle shown. Free filters are applied automatically at checkout, no code needed.
Boiling needs a working stove and fuel, and during a blackout many homes have neither. It also needs water to boil. The filter needs nothing and works on the murky water you actually find.
Bacteria, protozoa, sediment and microplastics. Not viruses, chemicals, heavy metals or salt water. Exact numbers will be on our Lab Report page once the independent test is published.
The filter is with an independent laboratory now. We will publish the full report, including anything that did not go our way, on our Lab Report page. Enter your email at the bottom of this page and we will send it to you the day it is out.
Stored dry and unused it keeps for years. Use it once, blow it clear, let it dry, and it goes back in the drawer.
One per person, one for the vehicle, one spare. Two is one, one is none. A family of four keeps five. If your parents live alone, add their set, that is the top tier above.
Yes. Nothing to assemble or prime. Put the end in the water and drink, or fill a bottle for them.
City water is the one that depends on electric pumps. Texas 2021, Asheville 2024 and every boil-water notice in between hit homes with a tap, not homes with a well.
Blow back through the mouthpiece after use, shake out the water, let it dry with the cap off. No tools, no replacement parts.
60-day money-back guarantee. Send it back, we refund the order. The only way you lose is not having it when you need it.
One filter per person, one for the vehicle. Free filters are applied automatically at checkout, and you have 60 days to change your mind.
