SLF Water Filtration Comparison · 2026
Frizzlife M800
Strong option for high-flow non-electric under-sink RO.
VIVA21 6-Stage Alkaline RO
Recommended
VIVA21 6-Stage Alkaline RO
Choose the VIVA21 6-Stage if you want an affordable traditional under-sink RO system with alkaline remineralization and stronger certification positioning than many budget RO systems.
RO Performance & Ownership
Compare RO output, filtration stages, remineralization, contaminant evidence, certifications and ownership cost.
Which Is Right for You?
Frizzlife M800
Best for: Households wanting high-flow under-sink RO with remineralization and no electricity requirement.
VIVA21 6-Stage Alkaline RO
Best for: Households wanting a traditional under-sink RO system with remineralization and a dedicated storage tank.
Consider if: Budget Under $300, Want Remineralization
Our Recommendation
Frizzlife M800
Strong option for high-flow non-electric under-sink RO.
VIVA21 6-Stage Alkaline RO
A compelling value-oriented alternative to higher-priced tankless RO systems for households that don't mind giving up cabinet space for a conventional storage tank.
The Short Answer
Choose the M800 if you want high-output tankless RO, alkaline remineralization and auto flush without needing electricity.
Choose the VIVA21 6-Stage if you want an affordable traditional under-sink RO system with alkaline remineralization and stronger certification positioning than many budget RO systems.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, Frizzlife M800 or VIVA21 6-Stage Alkaline RO?
VIVA21 6-Stage Alkaline RO is the overall pick for this specific matchup. Choose the VIVA21 6-Stage if you want an affordable traditional under-sink RO system with alkaline remineralization and stronger certification positioning than many budget RO systems.
Which system has the higher daily filtration capacity?
Frizzlife M800 has the higher rated output: 900 GPD versus 50 GPD.
Which system offers remineralization?
Both systems are listed as yes for remineralization in the current SLF records.
Which system has the lower MSRP?
Frizzlife M800 has the lower MSRP in the current SLF records at $329.99, compared with $339.99 for the other system.
Do both systems require a plumbing connection?
Frizzlife M800: Yes. VIVA21 6-Stage Alkaline RO: Yes.
Which system is more renter friendly?
Frizzlife M800: No. VIVA21 6-Stage Alkaline RO: No. Check lease and plumbing-modification rules before installing an under-sink system.
What certifications are listed for these systems?
Frizzlife M800: Frizzlife states the M800-new is independently tested/certified by SGS against NSF/ANSI 58 and 372 and displays NSF/ANSI 42, 53, 58 and 372 in product marketing. An exact-model NSF, WQA or IAPMO listing was not independently verified, so these standards are treated as third-party testing evidence rather than formal NSF/WQA/IAPMO certification. VIVA21 6-Stage Alkaline RO: Manufacturer states VIVA21 6-Stage Alkaline RO (V21RS6S01PH) is WQA Gold Seal certified to NSF/ANSI 58 for RO system performance and NSF/ANSI 372 for lead-free materials. WQA Gold Seal is third-party product certification. SLF has not independently confirmed the exact model in WQA's public certified-product directory; retain manufacturer-source qualification pending direct directory verification.