What the maker declares it reduces, and nothing more · review
A 4-stage faucet filter with 0.01 μm ultrafiltration and activated carbon fiber, for cold water only.
Ten nanometers, and it sits in the ultrafiltration band: fine enough to intercept bacteria and fine particulates, coarse enough to let dissolved minerals through.
Which is why the same page says it does not reduce TDS. The two statements agree with each other, and that coherence is worth noticing on this shelf.
Compare the Filterbaby at $108.00, which claims “Japanese 0.000001 mm carbon fiber” — one nanometer, ten times finer, at molecular scale. That is reverse osmosis territory, and a membrane that fine would lower TDS.
One of those two figures fits the rest of its own page. The other does not.
Male 15/16 in, 13/16 in, M21.5, M18.5. Female 55/64 in, M18.5.
In both inch and metric, which is what the compatibility question on this shelf needs — along with the exclusion that five of these seven listings share: no pull-out, hand-held, spray-style or sensor faucets.
These screw onto an aerator thread. A pull-out spray head does not have one.
Cold water only. Do not reduce TDS. Does not fit pull-out, hand-held, spray style faucets.
And then, in the second bullet, a recommendation to buy something else: If you’re looking to lower the TDS value, we recommend choosing the Waterdrop RO system instead.
That is the most honest page on this shelf, and it is worth saying so plainly.
An unfiltered bathroom faucet runs at about 1.2 GPM — roughly 4.5 liters a minute.
This is about a fifth of that.
For cupping cold water to your face, fine, and arguably nicer. For rinsing the sink, filling a glass, or anything involving a container, it is slow every single time.
On this shelf: Frizzlife 1.2 GPM, Waterdrop’s own FC-01 about 0.53, WINGSOL 0.5, this 0.26.
Forty-one to a hundred degrees Fahrenheit, and cold water only in bold at the top of two bullets.
Carbon and ultrafiltration membranes both degrade with heat, so the limit is genuine rather than cautious.
But this is a bathroom sink, where people wash their faces in warm water. So every morning there is a choice: cold filtered, or warm unfiltered.
The Tylola on this shelf publishes 39-140 °F and takes warm water, and names five filter media including KDF 55 and calcium sulfite. If warm filtered water is what you want, that is the listing.
NSF/ANSI 372 certifies the housing is lead-free. It tests no filtration at all.
So the 0.01 micron figure, the four stages and the chlorine reduction are all uncertified on this page.
Waterdrop’s own FC-01 — $14 cheaper — holds NSF/ANSI 42 as well, which certifies the chlorine, taste and odor reduction. The WINGSOL holds 42 and 53.
At $11.33 a month of supply against about $3.00 from the multi-cartridge packs here, and $6.66 from its better-certified sibling, this is a hard listing to recommend on anything except the membrane figure — which is, to be fair, the one thing on it that no other page can match.
Available at around $33.99 on Amazon.com when we checked on October 29, 2026, for delivery to a US address.
Stock and prices on Amazon.com move without notice; the button above opens the live listing.
Prices quoted in this text were read on October 29, 2026. The live price is at the top of the page.
| Filter type | 4-stage with 0.01 μm ULTRAFILTRATION — the only membrane figure on this shelf that is physically plausible — on activated carbon fiber media. Certified NSF/ANSI 372, WHICH IS MATERIAL SAFETY ONLY: neither NSF 42 nor NSF 53 is published, so the chlorine and skin-irritant claims are the maker’s own. |
|---|---|
| Stated capacity | NO GALLON CAPACITY IS PUBLISHED on this listing — only a 3-month lifespan, at $11.33 a month of supply. The maker’s own 320-gallon model on this shelf gives both. |
| Declared reductions | Chlorine, taste, odor and skin irritants. TDS is not reduced; the maker names its RO system instead. |
| Connection size | Male 15/16 in, 13/16 in, M21.5 or M18.5; female 55/64 in or M18.5 — SIX EXACT THREADS, the most precise connection data on this shelf. NOT COMPATIBLE with pull-out, hand-held, spray style or sensor faucets. |
| Stated flow rate | 1 L/min — about 0.26 GPM, THE SLOWEST ON THIS SHELF, a quarter of the Frizzlife. COLD WATER ONLY, with an operating range of 41–100 °F / 41 to 100 °F (5–38 °C). |
| Cartridge | Replacements sold as a three-pack, reference B07C3LFJR2 (Ultra). 9.1 oz (259 g). |
| Amazon reference | B07C3CKTHZ |
| EAN | 0840814145807 |
Yes, and it is worth comparing with the one on the most expensive listing here. 0.01 μm is 10 nanometers, which is squarely in the ultrafiltration range — fine enough to intercept bacteria and fine particulates, coarse enough to let dissolved minerals through, which is exactly why Waterdrop also says it does not reduce TDS. The two statements are consistent. The Filterbaby on this shelf claims "Japanese 0.000001 mm carbon fiber" — which is 1 nanometer, ten times finer, and at molecular scale: that is reverse osmosis territory, and a membrane that fine would reduce TDS. Waterdrop’s figure hangs together with the rest of its page. The other does not.
Slower than people expect. An unfiltered bathroom sink runs at roughly 1.2 GPM — about 4.5 liters a minute — so this is about a fifth of faucet flow. For cupping water to a face, that is adequate and arguably pleasant. For rinsing a sink, filling a glass or anything with a container involved, it is slow enough to notice every time. On this shelf the Frizzlife publishes 1.2 GPM, the Waterdrop FC-01 about 0.53 and the WINGSOL 0.5. If flow matters, this is the wrong one — and its own sibling at $19.99 is twice as fast with a better certification.
Because a bathroom sink is where people wash their faces in warm water, and this filter will not pass it: the operating range is 41-100 °F / 41 to 100 °F (5-38 °C), and the maker puts "Cold water only" in bold at the start of two separate bullets. Activated carbon and ultrafiltration membranes both degrade with heat, so the limit is real rather than cautious. The practical consequence is a choice every morning: cold filtered water, or warm unfiltered. The Tylola on this shelf publishes 39-140 °F, which does take warm water, and names five filter media. If warm filtered water is the point, that is the listing.
Same category, nearby prices, between bathroom fittings. What remains is the specifications every one publishes — half empty, a column is no use.
| Model | Price | Filter type | Stated capacity | Declared reductions | Connection size |
|---|---|---|---|---|---|
| Waterdrop FC-02 bathroom faucet filter | $34 | 4-stage with 0.01 μm ULTRAFILTRATION — the only membrane figure on this shelf that is physically plausible — on activated carbon fiber media. Certified NSF/ANSI 372, WHICH IS MATERIAL SAFETY ONLY: neither NSF 42 nor NSF 53 is published, so the chlorine and skin-irritant claims are the maker’s own. | NO GALLON CAPACITY IS PUBLISHED on this listing — only a 3-month lifespan, at $11.33 a month of supply. The maker’s own 320-gallon model on this shelf gives both. | Chlorine, taste, odor and skin irritants. TDS is not reduced; the maker names its RO system instead. | Male 15/16 in, 13/16 in, M21.5 or M18.5; female 55/64 in or M18.5 — SIX EXACT THREADS, the most precise connection data on this shelf. NOT COMPATIBLE with pull-out, hand-held, spray style or sensor faucets. |
| ATOJET faucet filter, one-year set | $35 | A 6-stage carbon composite — a sediment layer and a compressed activated carbon core — plus a CERAMIC CARTRIDGE against mineral buildup from stagnant water, in an Ecozen housing, plant-based and BPA-free, stated safe for skin. The filters are stated TESTED TO NSF/ANSI 42 STANDARDS, and ROHS; neither NSF 53 nor NSF 372 is published. | NOT PUBLISHED IN GALLONS. The listing gives a one-year set with each filter stated to last up to 2 months — $2.92 a month of supply at $34.99 on October 29, 2026, the lowest on this shelf. | Chlorine, stated to be Minimized rather than reduced by any figure, aimed at sensitive or easily irritated skin and scalp. | NOT PUBLISHED as a size. In the box: the filter, Teflon tape, a wrench, NINE connection adapters and a rubber ring. |
| Tylola faucet filter for hard water | $30 | A five-media cartridge — carbon fiber, 100% coconut shell activated carbon, KDF 55, calcium sulfite and PP cotton — in a durable ABS housing. The certification is « NSF-tested filter materials » with NO NSF STANDARD NUMBER PUBLISHED, which is a claim about the media and not about a result. | Up to 100 gallons or about 2 months per cartridge, so about 500 gallons or ten months in all — $3.00 a month of supply, level with the Frizzlife and eight cents above the Atojet year. | NONE ARE NAMED AS SUCH. The listing names the five media and leaves the reader to infer what they do, where every other filter on this shelf states at least a target. | NOT PUBLISHED. NOT COMPATIBLE with pull-out, handheld, spray-style or sensor faucets. |
| WINGSOL stainless faucet water filter | $30 | A cartridge filter in a seamless one-piece food-grade lead-free 304 stainless steel housing, on a 360° swivel. CERTIFIED NSF/ANSI 42 AND 53 — THE ONLY 53 ON THIS SHELF, and 53 is the health-effects standard the heavy-metal claims on this shelf otherwise rest on nothing. | 350 gallons, up to 3 months per cartridge — $0.086 a gallon, $10.00 a month of supply. | PFAS, PFOA, PFOS, chlorine, heavy metals and odor. Minerals are preserved and the maker states it cannot reduce TDS. | Male 0.38–0.94 in; female 0.75–0.94 in, with multiple adapters. NOT COMPATIBLE with pull-out, hand-held, spray style or sensor faucets. |
This model is listed on Amazon.com, at ≈ $34 at the last reading. Listed is not the same as in stock: availability changes daily, and the buy box shows the live price.
Details checked on October 29, 2026.
Washing a face in cold filtered water, where 0.01 micron is the specification you came for
Specifications: the manufacturer sheet for bathroom fittings and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Bathroom sink faucet filter, one-year set · 6-stage carbon composite · sediment and activated carbon layers
A bathroom sink faucet filter with a 6-stage carbon composite element and a year of cartridges supplied.
Best for: Someone who wants a year of cartridges in one purchase and will not be measuring anything
≈ $35
Skincare faucet filter · clinical hydration claim by the maker · no micron rating published
A skincare-focused faucet filter with a three-month cartridge and ten adapters, for round aerator faucets.
Best for: Nothing on this shelf that a $29.99 certified filter does not do, unless the fitting kit is the obstacle
≈ $108
Faucet filter and extender · micron-level · 99% of chlorine claimed · DOE, CEC and NSF certified
A faucet filter and 1080° extender with nine cartridges, two spray modes and seven thread sizes.
Best for: A sink that has to reach — and one of the three cheapest cartridge supplies on this shelf
≈ $27
