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· 7 in stock · prices checked Nov 1, 2026, 6:03 AM ET
Best water filters under $50, per rated gallon
In-stock water filters under $50 today, ranked by price ÷ the gallons the brand says the filter is rated for. Small enough for a go-bag or glovebox. Every price point: cheapest water filter per gallon.
The ranking lowest cost per rated gallon first
Every store link here is a paid link. For these brands we have no affiliate program yet, so instead of a buy button there's a "Compare on Amazon" search link; prices shown are the brand stores' own, and Amazon's may differ. Rankings are pure math.
| Rank | Product | $ / rated gallon | Rated (brand) | Price today | vs. last week |
|---|---|---|---|---|---|
| #1 | Puribag Micro - Mini membrane water filter Uncharted Supply Co In stock | $0.0174 | 1,321 gal | $22.99 | no change |
| #2 | Puribag Pro - Membrane Filter Kit Uncharted Supply Co In stock | $0.0227 | 1,321 gal | $29.99 | no change |
| #3 | LifeStraw Peak Series Straw Echo-Sigma In stock | $0.0300 | 1,000 gal | $29.99 | +15% from $25.99 |
| #4 | LifeStraw SIP Echo-Sigma In stock | $0.13 | 264 gal | $34.95 | no change |
| #5 | Frontier Max Filter System Virus - Red line (RED-IV-120) Legacy Food Storage In stock | $0.42 | 120 gal | $49.99 | no change |
| #6 | Frontier Pro Ultralight Water Filter - Green Line (GRN-III-50-T) Legacy Food Storage In stock | $0.60 | 50 gal | $29.99 | no change |
| #7 | Puribag 120L System Uncharted Supply Co In stock | $1.42 | 32 gal | $44.99 | no change |
We have 15 days of price history (since Oct 17, 2026). Prices checked Nov 1, 2026, 6:03 AM ET at each brand's own store. Tax and shipping not included.
Sold out today (7)
- Survivor Filter Survivor Filter Straw Ultra Filter Replacement, last price $15.95
- Survivor Filter Survivor Filter Straw Cotton Filter Pads Replacement (20 Pack), last price $9.95
- Survivor Filter Survivor Filter Straw Carbon Filter Replacement, last price $13.95
- Survivor Filter SURVIVOR FILTER™ Cleanable Water Filter Straw (Model: L600 UPC Code: 628250537437), last price $33.95
- Survivor Filter SURVIVOR FILTER SQUEEZE™ Water Filter + 2 Canteens, last price $38.95
- Survivor Filter Replacement Filter for Active All Terrain and Americana Ultra Light Water Bottle, 2-Pack, last price $29.95
- Survivor Filter SURVIVOR FILTER™ Active All Terrain Filtration Bottle & Carrier System, last price $45.95
Prepared, not scared
Cheapest isn't always best: check what each product includes on the brand page, and buy for the household you actually have. The Kit Calculator works out how much food and water that is.
More water storage & filters rankings
Questions people ask
What is the cheapest water filters under $50 right now?
At today's prices: Uncharted Supply Co Puribag Micro - Mini membrane water filter at $0.0174 per rated gallon ($22.99). This page updates every day.
How often is this ranking updated?
Daily. We check each brand store once a day and rebuild this page; the last check was Nov 1, 2026, 6:03 AM ET.
Why isn't my favorite brand listed?
We only collect prices from stores whose terms allow automated price checks. Brands that forbid it, such as EcoFlow, Jackery and Sawyer, are listed on our methods page.