SLF Water Filtration Comparison · 2026
VIVA21 5-Stage RO
Recommended for shoppers seeking an affordable traditional under-sink RO system with stronger certification positioning than many budget alternatives.
Waterdrop G2P600
A strong value pick for households that want 600 GPD tankless RO performance without paying for the G3P600's smart TDS faucet and broader certification profile.
Waterdrop G2P600
Choose the G2P600 when price and 600 GPD output matter more than a TDS display and the G3P600's additional certification features.
RO Performance & Ownership
Compare RO output, filtration stages, remineralization, contaminant evidence, certifications and ownership cost.
Which Is Right for You?
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
Waterdrop G2P600
Best for: Families and households that want fast 600 GPD tankless reverse osmosis at a lower purchase price than Waterdrop's G3-series systems.
Consider if: Budget Under $300, Low Replacement Cost, High Daily Output
Our Recommendation
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.
Waterdrop G2P600
The Waterdrop G2P600 is worth considering for families that want fast, tankless under-sink RO filtration at a more approachable price. The tradeoff is a simpler feature and certification package than Waterdrop's G3-series models.
The Short Answer
Choose the VIVA21 5-Stage for low purchase and maintenance costs; choose the 6-Stage Alkaline version if you specifically want remineralization.
Choose the G2P600 when price and 600 GPD output matter more than a TDS display and the G3P600's additional certification features.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, VIVA21 5-Stage RO or Waterdrop G2P600?
Waterdrop G2P600 is the overall pick for this specific matchup. Choose the G2P600 when price and 600 GPD output matter more than a TDS display and the G3P600's additional certification features.
Which system has the higher daily filtration capacity?
Waterdrop G2P600 has the higher rated output: 600 GPD versus 50 GPD.
Which system offers remineralization?
Both systems are listed as no for remineralization in the current SLF records.
Which system has the lower MSRP?
VIVA21 5-Stage RO has the lower MSRP in the current SLF records at $289.99, compared with $359.99 for the other system.
Do both systems require a plumbing connection?
VIVA21 5-Stage RO: Yes. Waterdrop G2P600: Yes.
Which system is more renter friendly?
VIVA21 5-Stage RO: No. Waterdrop G2P600: No. Check lease and plumbing-modification rules before installing an under-sink system.
What certifications are listed for these systems?
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. Waterdrop G2P600: Exact-model G2P600 is listed to NSF/ANSI/CAN 372 through IAPMO R&T. Separate exact-model materials document SGS and CSA third-party testing according to NSF/ANSI 42, 53, 58 and 401. Testing to these standards should not be represented as certification/listing to those standards.
How do estimated annual filter costs compare?
VIVA21 5-Stage RO: $60.00. Waterdrop G2P600: $104.98. Actual replacement timing and prices can vary.