Frizzlife's current MK99 product documentation and certification claims.
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One of the easiest under-sink filters to justify for basic city water
Frizzlife publishes a two-stage 0.5-micron system, quick-change cartridge design, 2 GPM-class high flow, and certification claims for lead, chlorine, taste/odor and particulates under NSF/ANSI 42 and 53 through IAPMO.
What you get
Published filtration precision.
Compound cartridge architecture.
High-flow direct-connect design.
Typically around the $60 range before promotions.
What MK99 does not replace
It is not a reverse-osmosis system. It does not target dissolved solids the way RO does, and it should not be assumed to handle PFAS, nitrate, arsenic or other contaminants unless the exact model's certification and performance sheet say so.
If PFAS is your primary concern, use EPA's recommendation to look for an exact NSF/ANSI 53 or 58 PFAS reduction claim rather than relying on broad carbon-filter language.