Your tap is an electrical appliance. Most people find that out at the worst possible time.
Most people assume the water keeps running when the lights go out.
It doesn't.
The water itself doesn't disappear. But every drop that reaches your house got there because a pump pushed it, and a treatment plant cleaned it first. Both of those run on electricity. When the grid stops, the water doesn't stop being there. It stops being delivered, and it stops being safe.
Here is roughly how fast it comes apart.
HOUR 1. Treatment stops. The pumps, filters, and disinfection that make municipal water drinkable all run on power. Cut the power and the cleaning stops first, before you notice anything at the tap.
HOURS 2 TO 6. Pressure dies. With nothing pushing it, the water already sitting in the pipes drains out to whoever is lower than you. Your taps go from strong, to weak, to air.
HOURS 6 TO 12. The reserve empties. Water towers hold a buffer for short outages. That buffer is measured in hours, not days.
WEEK 1 AND BEYOND. Coming back is slow. Restoring pressure is not the same as restoring safe water. Lines have to be flushed and tested before a boil notice gets lifted, and that part is measured in weeks.
The 72 hour figure you have heard is a preparedness guideline for how long you should be able to take care of yourself. It is not a promise about when your tap comes back.
The water you stored is a countdown
Most people who feel covered are picturing the cases in the garage. Do the arithmetic once and the feeling changes.
The standard public guidance is one gallon per person per day, and that one gallon is drinking plus basic sanitation. It does not include a shower, a load of dishes, or a toilet you would like to flush more than once.
For a family of four that is four gallons a day at the floor. Three cases of bottled water, which is more than most households actually keep, is about two days.
Stored water only moves in one direction. Down. And the day it reaches zero, the tap is still unsafe.
This is not a doomsday hypothetical. In February 2021 a winter grid failure in Texas put more than 14 million people under boil water notices, according to state environmental regulators, some of them for more than a month. In 2024 Hurricane Helene tore up water infrastructure across western North Carolina, and Asheville went 53 days before its boil notice was lifted.
Neither one was an attack. Neither one was an EMP. That was just weather.
Stored water is not a plan. It is a deadline.
Stop storing clean water. Start making it.
Here is the part most people never turn over: you are almost never out of water. Creeks, ponds, lakes, rain barrels, and swimming pools sit within walking distance of most American homes.
The problem was never the quantity. The problem is what is in it.
- Bacteria. E. coli and salmonella thrive in still water. One swallow can have you vomiting within hours, and in a crisis with no clean water to replace what you are losing, the dehydration is the part that actually hurts you.
- Parasites. Giardia and cryptosporidium are invisible, common nationwide, and cause stomach illness that drags on for weeks.
- Runoff. Every rain washes animal waste and whatever is on the ground into the nearest water. The retention pond closest to a neighborhood is often the worst water around it.
- Algae and sludge. Stagnant water grows blooms that turn it green, make it smell, and can be toxic on their own.
- Sediment. Sand, silt, and rust, which wreck the taste and hide everything else floating in there.
One line worth being straight about: this list is biological and physical. Water you suspect of holding fuel, solvents, or agricultural chemicals is a different problem, and no hollow fiber filter on the market solves it. More on that below.
So the households that are actually ready made one change, and it was a change in the question. They stopped asking how much water they could store, because any amount runs out. They started asking how they would drink the water already around them.
Pour dirty water in the top. Drinkable water comes out the bottom.
The CLEARDRAW G1 turns a creek, a pond, or a rain barrel into drinking water for a whole household at once. No power. No pumping. No sucking on a straw.
The kit this page is about
CLEARDRAW G1 Gravity Water Filter
- 0.01 micron core, one full order of magnitude finer than 0.1
- 4,000 litres per core, about 1,057 gallons
- Six piece kit, 245 grams, packs flat
- 90 day money back guarantee, free shipping
You fill the one gallon reservoir, hang it from a branch, a hook, or a door frame, and open the clamp. Gravity pulls the water down through the core while you do something else. A full gallon takes about 13 minutes, and you do not have to stand there for any of it.
It cleans in two stages, and we are going to name both honestly rather than inflate the count.
STAGE 1. The 1 micron pre layer. A PP cotton layer catches sand, silt, rust flakes, and the visible debris before any of it reaches the membrane. This is the stage that keeps your flow rate from collapsing after the first few uses.
STAGE 2. The 0.01 micron wall. Millions of hollow fibers packed so tightly that bacteria and parasites physically cannot fit through. This is not a chemical treatment. It is a wall they cannot cross.
That number is the part worth slowing down on. Most portable filters in this price range use a 0.1 micron membrane. The G1 uses 0.01 micron, which is one full order of magnitude smaller. Finer pores are also why the flow is steady rather than fast. We would rather trade minutes for margin.
Pond water goes in. Drinkable water comes out. Every time.
What it will not do
An honest spec is more useful than an impressive one, so here is the other side of it.
It is built for natural fresh water, which means creeks, ponds, lakes, rain barrels and stored water. It is not a chemical filter, so do not run water you suspect contains fuel, industrial runoff, solvents, or agricultural chemicals through it.
We do not publish a heavy metals claim, because we do not have third party heavy metals data for this core. We would rather tell you that than imply otherwise.
The core is rated for 4,000 liters, which is about 1,057 gallons. It is rated, not infinite. Silty source water shortens it and backflushing after use extends it.
And one hard rule: never let the core freeze while it is wet. Ice ruptures the hollow fibers and the filter is finished. Dry it fully before it goes anywhere that drops below freezing.
What the older version of this design keeps getting wrong
This design is not new. A one gallon gravity bag of this general shape has been on the market for years, and the older version has thousands of owner reviews behind it. Most of them are positive, and fairly so. We read all of them anyway, because the useful part of a review set is never the praise. It is the same complaint turning up over and over, from people who already paid for the thing.
The number one complaint about the older version is not filtration. It is filling the bag. Out of 33 mentions of refillability, 20 were negative. It is the only topic in the whole review set where complaints outnumber praise. The filtration works. Living with it is what people struggle with.
"A second container is necessary to fill the bag, and that container is now contaminated with the raw water."
"The bag is difficult to fill in the river or lake and doesn't hang right from a tree or anything else. Neither the hanging handle nor the angle of it."
"Bring webbing or cordage to hang it. Holding it sucks."
Those are the three things we changed.
The fill port is reinforced and wide enough to scoop directly from a shallow creek, which is the whole point of not needing a second container. The strap is nylon webbing with a clip, rated to 30 kilograms, and it is in the box rather than being something you are told to bring. And the reservoir is 90 percent translucent, so you can see the level without taking it down.
The other recurring note in that category is flow. Some buyers call it slow. Ours runs at 300 ml per minute, so a full gallon takes about 13 minutes. We would rather tell you the number than let you find out.
What comes with it
- Works with the power grid down, because gravity is the only energy source involved
- A 0.01 micron ultrafiltration core, not the 0.1 micron common in this category
- Rated for 4,000 liters, about 1,057 gallons, per core
- Flows at 300 ml per minute, hands free
- Food grade TPU, BPA free, tested to GB 4806.7-2023
- The whole six piece kit weighs 245 grams and packs flat
- Veteran owned and operated
Frequently asked questions
Why not just buy a $20 filter straw?
A straw filters one person, one hard sip at a time. The G1 fills a full gallon hands free and serves a household, for drinking, cooking, and washing. A straw keeps one person going. This keeps a house going.
Why not just boil it?
Boiling needs fuel, a heat source, a pot, and time, and in the outage we are describing none of those are guaranteed. It also does nothing about sediment, silt, or taste. Gravity works the second you need it.
Does it remove viruses, or chemicals like lead?
No, and we will not pretend otherwise. Like every hollow fiber filter on the market, LifeStraw and Sawyer included, it removes bacteria, parasites, and particulates. For the creeks, ponds, rain, and stored water you would actually be drinking in a domestic emergency, that is the protection that matters. For suspected chemical contamination, no portable filter is the answer.
How long does the core last?
It is rated for 4,000 liters, about 1,057 gallons. That is one number, and it is the only one we publish. How long it lasts in practice depends on how dirty your source water is, and backflushing after each use keeps the flow strong instead of making you throw it away early.
Will it expire sitting in a closet?
The core has a five year shelf life sealed at room temperature. After use, air dry it fully before storage, and keep it away from freezing.
Is it hard to use?
Fill, hang, open the clamp. There is nothing to pump, charge, or squeeze, which is the reason it works when the person using it is a twelve year old or a grandparent and you are not home.
What if it is not right for me?
You have 90 days. Use it, test it, fill it from your garden hose and look at what comes out. If it is not what you expected, send it back.
The families who stay calm are the ones who got ready first
You have read the timeline. You already know the part most people do not, which is that the tap is downstream of the grid and the grid is not guaranteed.
There are two ways to leave this page.
You can go back to the arithmetic in the garage, and keep buying cases, and keep rotating them, and accept that whatever you stack up has a bottom.
Or you can stop storing the answer and start making it, so the number that matters is not how many gallons are on the shelf but whether there is water within walking distance. In most of America there is.
Ready when you are
CLEARDRAW G1 Gravity Water Filter
- 0.01 micron core, one full order of magnitude finer than 0.1
- 4,000 litres per core, about 1,057 gallons
- Six piece kit, 245 grams, packs flat
- 90 day money back guarantee, free shipping
One note before you go. The CLEARDRAW G1 is sold through our own site only. We do not list it on marketplaces, so if you find it somewhere else at a surprising price, it is not ours and we cannot honor the guarantee on it.
Kessworth is the seller of the product described above. Owner quotes on this page come from public reviews of an earlier, comparable one gallon gravity filtration system. They are not Kessworth customer reviews, and they describe that earlier design rather than the CLEARDRAW G1.