This page contains affiliate links. If you buy a product or service through such a link, we earn a commission at no extra cost to you. Learn more.
Our Verdict (Best for)
We tested the Frizzlife SK99-NEW, a low-cost under sink water filter, using our existing kitchen faucet (there’s also an optional dedicated faucet). The system was easy to set up, use, and maintain with a simple, light design. Also, flow from our faucet was strong enough for everyday use. However, while the filtered water tasted and smelled perfect, filtration results were disappointing, with 5 contaminants showing no or only partial reduction in our lab testing. In addition, methylene chloride appeared post-filtration although well below the strictest health guidelines. On top of that, the Frizzlife SK99-NEW has only very few NSF certifications and provides no additional NSF testing beyond that. Finally, the manual says not to use with water above 3 gpg hardness. Bottom line: There are better under sink water filters in that price range!
The Frizzlife SK99-NEW (for simplicity, we’ll refer to it as the SK99 throughout this review) is an under sink water filter that requires a plumbing connection and can be installed either inline or with an extra faucet (Frizzlife SP99). It’s designed for use as a drinking water filter and can purify both tap water and properly disinfected well water.
As usual, we’ve tested the system with our own hands:
- Hands-on experience: We installed/assembled, used, and maintained it.
- Filtration effectiveness: We sent an unfiltered and a filtered tap water sample to a professional lab for analysis in order to determine real-life contaminant reduction capabilities. Plus, we checked for NSF certifications and other test data.
- More testing: We performed a taste & odor test and a filtration speed test.
- All other product aspects: We considered initial + long-term cost, product warranties, additional features, frequent customer complaints, etc.
Contents
Overall Rating: /5.00
Filtration: /5.00
Usability: /5.00
Costs: /5.00
| Type: | Under Sink Water Filter |
| Price (May 5, 2025, w/o Short-Term Sales): | $125.99-129.99 (Use Code BOSSK15 for 15% Off!) |
| Estimated Yearly Cost (May 5, 2025): | ~$45-90 |
Check Current Price of Faucet Version (Remember Our Discount Code!)
(Use Code BOSSK15 for 15% Off!)
Overall Rating: /5.00
What We Like Most
- Filtered water tasted and smelled perfect.
- Easy to set up, prime, and use.
- Metal-braided tubing.
- Strong enough water flow for everyday use (we kept our regular kitchen faucet but there’s also an optional dedicated faucet).
- Easy to maintain thanks to modular filters; filter wrench provided.
- Affordable upfront cost and very good annual maintenance costs.
What We Don’t Like
- No or partial reduction for 5 contaminants in our lab testing.
- Methylene chloride appeared in filtered water but below strictest health guidelines.
- Holds NSF certifications for 4 contaminants only.
- Manual says not to use it with water with > 3 gpg hardness.
- No filter life indicator.
- 3rd-party customers complained about leaking (though Frizzlife says this has been upgraded) and taste issues.
How the Frizzlife SK99 Compares to…
18 Other Under Sink Water Filters
In this video, Sara highlights our under sink water filter top picks. The Frizzlife SK99 was included in our testing, but didn’t make the cut.
Please note: Our full guide on the best under sink water filters is available here.
Video Chapters + Comparison Sheet
- Link to Comparison Sheet
- 00:00 – Intro
- 00:34 – How We Tested & Rated
- 01:53 – Our Recommendations
- 03:01 – Best Overall (Cloud RO)
- 15:11 – 2 Best Tankless ROs (Waterdrop G3P600 & X12)
- 27:26 – Best Non-RO Filter (Epic Smart Shield)
- 31:22 – Highest Filtration Score (Aquasana SmartFlow)
- 32:02 – Made in USA (USWS All American & Home Master TMHP-L)
- 32:34 – Budget RO Pick (APEC ROES-50 Essence)
- 32:51 – AO Smith AO-US-200 & Culligan US-EZ-4
- 33:34 – Summary
Full Analysis of the Frizzlife SK99
Filtration: /5.00
1. Lab Results: /5.00
Remember that our before vs after lab comparison is not an exact science. It’s informational and subject to variability, inaccuracies, and interferences caused by natural fluctuations in water quality, accidental contamination, human error, instrumentation issues, and more. Furthermore, our lab-testing is limited to those contaminants present in our water supplies and at their respective concentrations. As such, it can only give us a general idea for how effective a certain water treatment product might be.
Lab Results Chart
| Potentially Harmful | Aesthetic Issues | Feed Water Level | Filtered Water Level | Reduction Rate | |
| Water Disinfectants | |||||
| Chlorine (mg/L) | ✖ | ✖ | 0.89 | 0 | 100% |
| Disinfection Byproducts | |||||
| Bromodichloromethane (µg/l) | ✖ | 1.81 | 0 | 100% | |
| Bromoform (µg/l) | ✖ | 1.79 | 0 | 100% | |
| Dibromochloromethane (µg/l) | ✖ | 2.75 | 0 | 100% | |
| Chloroform (µg/l) | ✖ | 0.93 | 0 | 100% | |
| Metals | |||||
| Copper (mg/L) | ✖ | ✖ | 0.09 | 0 | 100% |
| Barium (mg/L) | ✖ | 0.04 | 0.04 | 0% | |
| Boron (mg/L) | ✖ | 0.06 | 0.04 | 33% | |
| Zinc (mg/L) | ✖ | 0.04 | 0.01 | 75% | |
| Strontium (mg/L) | ✖ | 0.42 | 0.41 | 2% | |
| Salts | |||||
| Nitrate (N) (mg/L) | ✖ | 1.89 | 1.41 | 25% | |
| Fluoride (mg/L) | ✖ | 0.58 | 0.58 | 0% | |
| Other | |||||
| Uranium (µg/L) | ✖ | 1 | 0 | 100% | |
| Impurities NOT Detected in Unfiltered Tap Water Sample | |||||
| Methylene Chloride (µg/l) | ✖ | 0 | 0.68 | ||
| Explanation: | |||||
| Full Removal | |||||
| Considerable Reduction | |||||
| Concentration More Than Double of Unfiltered Water Sample | |||||
| Potential Leaching Reached or Exceeded the Strictest Public Health Guideline We Could Find | |||||
*100% means reduction to below the minimum detection level. To learn more about our testing procedures check our editorial guidelines.
Link to Filtered Water Report
Link to Unfiltered Water Report
Usability: /5.00
Costs: /5.00
Please note: This page is still a work in progress. Additional content and details will be added shortly – stay tuned!
Further Reading
About the Author(s)
Sara has been a lifelong home-improvement fan (she’s been hooked on This Old House since she was five) and taught herself any project she didn’t already know by watching YouTube tutorials. She is also an award-winning filmmaker. Armed with this skillset, Sara installs, primes, samples, uses, and maintains nearly every point-of-use water treatment systems we test – then brings her results to life on camera for our YouTube channel.
Raoul has a background in mechanical engineering and has been writing about home water treatment since 2015. He designs our product review processes, analyzes the results, and ties everything together. As editor-in-chief, he tries hard to keep the whole operation running smoothly behind the scenes.