SLF Water Filtration Comparison · 2026
BOROUX Legacy
Recommended for households wanting premium, installation-free gravity filtration.
British Berkefeld SS2 2.25
A strong BOROUX alternative for shoppers who prefer ceramic gravity filtration and a lower-capacity stainless steel system.
British Berkefeld SS2 2.25
Choose British Berkefeld for proven ceramic gravity filtration; choose BOROUX if larger capacity and its Foundation Filter ecosystem matter more.
Water Filtration Performance & Ownership
A fast side-by-side look at filtration, installation, capacity, certifications and ownership cost.
Which Is Right for You?
BOROUX Legacy
Best for: Families, Renters, and households wanting high-capacity gravity filtration without installation.
Consider if: Limited Counter Space, Avoid Plumbing, Renting
British Berkefeld SS2 2.25
Best for: Renters, small families, Preparedness, and households wanting proven ceramic gravity filtration without plumbing or electricity.
Consider if: Avoid Plumbing, Renting, Low Replacement Cost
Our Recommendation
BOROUX Legacy
Strong premium choice for families and renters who prefer gravity filtration over plumbed or powered systems.
British Berkefeld SS2 2.25
Recommended
The Short Answer
Choose it for high-capacity gravity filtration without plumbing; add Proactive Filters if fluoride reduction is a priority.
Choose British Berkefeld for proven ceramic gravity filtration; choose BOROUX if larger capacity and its Foundation Filter ecosystem matter more.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, BOROUX Legacy or British Berkefeld SS2 2.25?
British Berkefeld SS2 2.25 is the overall pick for this specific matchup. Choose British Berkefeld for proven ceramic gravity filtration; choose BOROUX if larger capacity and its Foundation Filter ecosystem matter more.
Which system offers remineralization?
Both systems are listed as no for remineralization in the current SLF records.
Which system has the lower MSRP?
British Berkefeld SS2 2.25 has the lower MSRP in the current SLF records at $305.00, compared with $399.00 for the other system.
Do both systems require a plumbing connection?
BOROUX Legacy: No. British Berkefeld SS2 2.25: No.
Which system is more renter friendly?
BOROUX Legacy: Yes. British Berkefeld SS2 2.25: Yes. Check lease and plumbing-modification rules before installing an under-sink system.
What certifications are listed for these systems?
BOROUX Legacy: WQA certified to NSF/ANSI 42, NSF/ANSI/CAN 401, and NSF/ANSI/CAN 372. British Berkefeld SS2 2.25: Ultra Sterasyl operating instructions state the British Berkefeld SS2 Ultra Sterasyl is tested and certified by NSF International to NSF/ANSI 42 and 53 for specified claims and NSF/ANSI 372. Doulton also markets current Ultra Sterasyl systems with NSF/ANSI 401 certification; verify exact filter/SKU configuration before expanding certified claims.
How do estimated annual filter costs compare?
BOROUX Legacy: $139.00. British Berkefeld SS2 2.25: not currently listed. Actual replacement timing and prices can vary.