If you've spent more than 20 minutes in a prepper community, you've seen Berkey filters recommended. They were, for a decade, the gold-standard gravity water filter for emergency preparedness. Then things got complicated.
In 2022, EPA regulations required gravity water filters sold in the US to be registered as "pesticide devices." Berkey's filters hadn't been registered this way, which led to a series of legal and compliance issues — and as of 2024, Berkey is no longer selling its products directly in the US market. You can still find them on third-party marketplaces, but the situation is murky enough that I'd recommend looking elsewhere for your primary emergency water filter.
The good news: there are excellent alternatives. Let me walk you through what to look for and my top picks for apartment and small-space preppers.
What to Look for in an Emergency Water Filter
Before I get to the product picks, here's what actually matters when evaluating a gravity water filter for emergency use:
- Filtration capability — At minimum, you want NSF Standard 42 (aesthetic chlorine) and Standard 53 (lead, cysts, volatile organics). For preparedness, look for filters that also handle biological contaminants like giardia and cryptosporidium.
- Flow rate — How long to filter a gallon? Gravity filters are slow by nature, but there's a big range. 1 gallon/hour vs. 3+ gallons/hour matters when you're actually relying on it.
- Capacity — How many gallons per day can you realistically produce? Size this to your household.
- Countertop or no-power design — For apartments, gravity-fed countertop systems are ideal. They need no installation, no electricity, and can be stored in a closet between uses.
- Filter replacement cost and lifespan — The purchase price is the beginning of the cost, not the end.
FEMA recommends 1 gallon per person per day minimum for drinking and sanitation in an emergency. A family of four needs at least 4 gallons per day. Plan accordingly when sizing your filter setup.
My Top Picks for Apartment Preppers
1. ProOne Big+ — Best Overall Berkey Alternative
ProOne Big+ Gravity Water Filter System
~$220The ProOne Big+ is the best direct alternative to the Berkey. It uses a two-stage filtration system that removes 200+ contaminants including fluoride, lead, chloramine, and biological pathogens. The G2.0 filter elements are NSF certified and last approximately 2,000 gallons each — comparable to Berkey's Black filters.
The stainless steel construction is sturdy. The flow rate is adequate for daily use (~1 gallon/hour for the 2-filter setup, faster with 4). It sits on your countertop, needs no installation, and works completely without electricity.
2. Alexapure Pro — Best Budget Pick
The Alexapure Pro filters down to 0.1 microns and removes 99.9999% of bacteria, cysts, and sediment. It's a solid choice at around $150, though the build quality and filter lifespan are a step below the ProOne. Good for a secondary filter or anyone on a tighter budget.
View Alexapure Pro on Amazon ↗3. LifeStraw Home — Best for Smaller Households
The LifeStraw Home is a 7-cup countertop pitcher with a membrane microfilter. It removes bacteria, parasites, microplastics, and chlorine. At ~$70, it's the most affordable gravity-filter option and works for 1-2 people. The downside: smaller capacity and slower flow rate.
View LifeStraw Home on Amazon ↗Side-by-Side Comparison
| Filter | Price | Capacity | Flow Rate | Filter Life | Best For |
|---|---|---|---|---|---|
| ProOne Big+Top Pick | ~$220 | 2.75 gal | ~1 gal/hr | 2,000 gal | Most households |
| Alexapure Pro | ~$150 | 2.25 gal | ~1 gal/hr | 5,000 gal | Budget preppers |
| LifeStraw Home | ~$70 | 7 cups | ~0.5 gal/hr | 100 gal | 1-2 people |
| Berkey (used) | ~$200-400 | 2.25-4 gal | ~1.5 gal/hr | 3,000 gal | If you find a legit one |
What About Water Storage?
A gravity filter is only useful if you have water to pour into it. In an extended emergency (think: water main break, prolonged power outage, contamination event), you need water storage too.
My minimum recommendation for apartment dwellers:
- WaterBOB (~$35) — A bladder that fits in your bathtub and stores 100 gallons. Buy one, keep it in the closet, fill it before a storm. It pays for itself immediately.
- Reliance Aqua-Tainer 7-gal jugs (~$25 each) — Get two. Store them filled or empty under your sink/in a closet. Stackable, durable, and easy to transport if you need to evacuate.
Most urban emergencies don't involve total water loss — they involve water that's unsafe to drink due to contamination or boil orders. A good countertop gravity filter handles this perfectly. You're not planning for a three-year apocalypse; you're planning for a 3-14 day disruption. Size your prep accordingly.
My Recommendation
If you're starting from zero, here's what I'd do in order:
- Get a WaterBOB ($35) — it's the highest-impact per dollar for emergency water storage.
- Add 2-3 Aqua-Tainer jugs ($25 each) for ongoing stored water.
- Buy a ProOne Big+ (~$220) as your primary gravity filter, or the Alexapure Pro (~$150) if budget is tight.
This gives you a layered water security system for under $350 total — and you're in genuinely good shape for any scenario a city-dweller is realistically likely to face.
*Prices accurate as of January 2026. Check current pricing on Amazon.