SLF Water Filtration Comparison · 2026
GLACIER FRESH GFU06
Promising non-RO under-sink option for users prioritizing sediment, chlorine, taste/odor and ultrafiltration without wastewater.
Frizzlife MK99
Recommended for shoppers wanting an inexpensive, high-flow alternative to reverse osmosis for treated municipal water.
Frizzlife MK99
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.
Water Filtration Performance & Ownership
A fast side-by-side look at filtration, installation, capacity, certifications and ownership cost.
Which Is Right for You?
GLACIER FRESH GFU06
Best for: Households wanting compact under-sink ultrafiltration with no electricity or drain connection.
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
Our Recommendation
GLACIER FRESH GFU06
Promising non-RO under-sink option for users prioritizing sediment, chlorine, taste/odor and ultrafiltration without wastewater.
Frizzlife MK99
One of the strongest value direct-connect under-sink filters for households that do not need reverse osmosis.
The Short Answer
Choose the GFU06 if you want under-sink UF without electricity or wastewater; choose RO if dissolved solids, fluoride or heavy metals are the priority.
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.
Water Filter Comparison FAQs
Answers are generated from the current SLF product records for these two systems.
Which is better, GLACIER FRESH GFU06 or Frizzlife MK99?
Frizzlife MK99 is the overall pick for this specific matchup. 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.
Which system offers remineralization?
Both systems are listed as no for remineralization in the current SLF records.
Do both systems require a plumbing connection?
GLACIER FRESH GFU06: Yes. Frizzlife MK99: Yes.
Which system is more renter friendly?
GLACIER FRESH GFU06: Yes. Frizzlife MK99: Yes. Check lease and plumbing-modification rules before installing an under-sink system.
What certifications are listed for these systems?
GLACIER FRESH GFU06: Manufacturer states U06 meets NSF/ANSI 42, 53 and 401 standards certified by SGS, and NSF/ANSI 372 certified by CSA Group. NSF official listing search did not show U06 under the Glacier Fresh trade-name results checked 2026-09-23. 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.
How do estimated annual filter costs compare?
GLACIER FRESH GFU06: $69.98. Frizzlife MK99: $19.99. Actual replacement timing and prices can vary.