SLF Water Filtration Comparison · 2026
Frizzlife MK99
Recommended for shoppers wanting an inexpensive, high-flow alternative to reverse osmosis for treated municipal water.
Waterdrop 17UB
Recommended for households that prefer a separate filtered-water faucet and want very infrequent cartridge replacement without moving to reverse osmosis.
Waterdrop 17UB
Choose the Waterdrop 17UB if you want the longest-life standard UB model, a dedicated faucet, 0.75 GPM flow and no RO wastewater.
Water Filtration Performance & Ownership
A fast side-by-side look at filtration, installation, capacity, certifications and ownership cost.
Which Is Right for You?
Frizzlife MK99
Best for: Renters and homeowners on treated municipal water who want lead/chlorine reduction, strong flow and very inexpensive cartridge replacements.
Consider if: Budget Under $100
Waterdrop 17UB
Best for: Households wanting a dedicated filtered-water faucet, strong 0.75 GPM flow and up to 24, 000 gallons of rated filtration capacity.
Consider if: Limited Counter Space, Budget Under $100
Our Recommendation
Frizzlife MK99
One of the strongest value direct-connect under-sink filters for households that do not need reverse osmosis.
Waterdrop 17UB
A practical long-life under-sink system for shoppers who want a dedicated filtered-water faucet without RO complexity.
The Short Answer
Choose MK99 for 2 GPM flow, low-cost cartridges and mineral retention; choose Waterdrop 15UA for a long-life direct-connect alternative or a tankless RO if fluoride/TDS reduction is required.
Choose the Waterdrop 17UB if you want the longest-life standard UB model, a dedicated faucet, 0.75 GPM flow and no RO wastewater.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, Frizzlife MK99 or Waterdrop 17UB?
Waterdrop 17UB is the overall pick for this specific matchup. Choose the Waterdrop 17UB if you want the longest-life standard UB model, a dedicated faucet, 0.75 GPM flow and no RO wastewater.
Which system offers remineralization?
Both systems are listed as no for remineralization in the current SLF records.
Do both systems require a plumbing connection?
Frizzlife MK99: Yes. Waterdrop 17UB: Yes.
Which system is more renter friendly?
Frizzlife MK99: Yes. Waterdrop 17UB: Yes. Check lease and plumbing-modification rules before installing an under-sink system.
What certifications are listed for these systems?
Frizzlife MK99: Full MK99 system tested by IAPMO R&T against NSF/ANSI 42 and NSF/ANSI 53. Certification applies to specific certified reduction claims and should not be interpreted as certification for every contaminant covered by those standards. Waterdrop 17UB: Certified to NSF/ANSI 42 for chlorine, taste and odor reduction and NSF/ANSI 372 for lead-free material compliance. Certification documentation identifies IAPMO R&T/WQA testing. NSF/ANSI 53 and 401 certifications not verified for this model.
How do estimated annual filter costs compare?
Frizzlife MK99: $19.99. Waterdrop 17UB: $18.00. Actual replacement timing and prices can vary.