Certified gravity filtration - no power, no plumbing
BOROUX Legacy 3-Gallon
Gravity countertop filter by BOROUX · Certified claims
$399
2-filter configuration at boroux.com; 1.8-gallon Legacy Compact is $349 · checked October 23, 2026
Check current price at BOROUX Set a filter-change reminder
Our verdict
The gravity filter for people who read fine print: it publishes exactly what it is certified for and labels the rest as lab-verified. In a category famous for fuzzy claims, that honesty - plus the hardware warranty - earns it the top gravity spot.
Specifications & certification
| Type | Gravity countertop filter |
| How it works | The classic two-chamber stainless design: pour water in the top, gravity pulls it through Foundation carbon filters into the 3-gallon lower chamber. Works during power outages, at a cabin, anywhere. |
| Certification status | BOROUX states verbatim: 'WQA certified to NSF/ANSI 42, NSF/ANSI/CAN 401, and NSF/ANSI/CAN 372' for its Foundation filters. There is no NSF/ANSI 53 certification - its lead and PFAS numbers are third-party lab-verified claims, and BOROUX labels them that way. |
| Filter life | Pair lasts up to 12 months; BOROUX rates capacity up to 6,000 gallons per filter |
| Replacement filters | Foundation filter pair, $149 |
| Running cost | $149/yr at a 2-filter pace (pair $149 sale / $166 list) |
| Flow / pace | 1 gallon per hour with 2 filters; 2 GPH with 4 |
| Size | 23 in H x 9 in diameter assembled (15 in nested); 3-gallon capacity |
| Power & plumbing | None. Gravity only. |
| Warranty | Lifetime on chambers and spigot hardware; filters 1 year |
What it claims to reduce
These are BOROUX's own published figures, graded by the certification status above - we do not run a lab, and we do not upgrade a brand's wording.
- Up to 99.97% of lead, PFAS and chlorine (third-party lab-verified, per BOROUX)
- 80+ contaminants (BOROUX)
- Fluoride requires the separate Proactive add-on filter
Strengths
- Real WQA certification (42/401/372) - rare in gravity filters
- No electricity or plumbing, ever
- Stainless build with a lifetime hardware warranty
Trade-offs
- No NSF 53 - lead/PFAS claims are lab-verified, not certified
- Slow: plan on an hour per gallon
- Fluoride needs an add-on filter
Never miss a filter change
An overdue filter quietly stops doing its job. Our free reminder tool works out your next change date and gives you a calendar file in seconds.