SLF Water Filtration Comparison · 2026
Frizzlife M800
Strong option for high-flow non-electric under-sink RO.
VIVA21 5-Stage RO
Recommended for shoppers seeking an affordable traditional under-sink RO system with stronger certification positioning than many budget alternatives.
VIVA21 5-Stage RO
Choose the VIVA21 5-Stage for low purchase and maintenance costs.
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 5-Stage RO
Best for: Budget-conscious households that want a conventional, certified-positioned under-sink RO system with a storage tank and standard-size replacement filters.
Consider if: Budget Under $200, Low Replacement Cost
Our Recommendation
Frizzlife M800
Strong option for high-flow non-electric under-sink RO.
VIVA21 5-Stage RO
A strong budget-oriented conventional RO choice for households that have cabinet space and value certification and standard replacement filters over high output and connected features.
The Short Answer
Choose the M800 if you want high-output tankless RO, alkaline remineralization and auto flush without needing electricity.
Choose the VIVA21 5-Stage for low purchase and maintenance costs.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, Frizzlife M800 or VIVA21 5-Stage RO?
VIVA21 5-Stage RO is the overall pick for this specific matchup. Choose the VIVA21 5-Stage for low purchase and maintenance costs.
Which system has the higher daily filtration capacity?
Frizzlife M800 has the higher rated output: 900 GPD versus 50 GPD.
Which system offers remineralization?
Frizzlife M800: Yes. VIVA21 5-Stage RO: No.
Which system has the lower MSRP?
VIVA21 5-Stage RO has the lower MSRP in the current SLF records at $289.99, compared with $329.99 for the other system.
Do both systems require a plumbing connection?
Frizzlife M800: Yes. VIVA21 5-Stage RO: Yes.
Which system is more renter friendly?
Frizzlife M800: No. VIVA21 5-Stage 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 5-Stage RO: Filter United identifies exact model V21RS5S01 as WQA Gold Seal certified to NSF/ANSI 58 for reverse-osmosis system performance and NSF/ANSI/CAN 372 for lead-content compliance. SLF has not independently located the exact model in WQA's searchable public directory, so retain the manufacturer-source qualification until the directory record is captured.