How the Five Compare on the Numbers
One thing has to be said before any comparison. Only one of these five is a faucet water filter you can mount on a tap. PUR Plus Vertical is the complete system. iSingo, AQUA CREST, Cabiclean and Waterdrop are all replacement cartridges that fit PUR faucet mounts, sold in packs, and every one of them lists the same long string of PUR model numbers on its own listing.
They also all publish the same rated life. Every one of the five states 100 gallons or 3 months, which means the number people usually shop on tells you nothing here. What does separate them is which certification each one cites, and for what. Three cite two specific standards, one cites the certifying body without a standard, and one cites a different body altogether.
The weights in that last row cannot be compared and should not be. Two 6 packs are published at 0.65 and 1.87 pounds, and a 2 pack is published at 0.62, which is almost exactly the same as one of the sixes. At least one of those figures describes something other than what is in the box, so no weight ranking appears anywhere on this page.
What the Certifications Actually Cover
Standard 42 and Standard 372 Are Not Lead Reduction
iSingo, AQUA CREST and Waterdrop all use the same sentence structure: tested and certified by NSF International against NSF and ANSI standard 42 for the reduction of chlorine, taste and odor, and to standard 372 for lead free material. Read that carefully. The first standard covers taste and smell. The second covers what the filter itself is made of, not what it takes out of your water.
So a cartridge certified to both of those standards has been checked for chlorine, taste and odor, and checked not to add lead. Neither certification is a claim that it removes lead from your tap water. All three of those listings are worded accurately. It is the reader who is likely to compress two standards into one conclusion the wording does not support.
The Two Listings That Claim More
Cabiclean states that its filter is certified by NSF International to filter out lead, chlorine, fine particles, odors and other contaminants, and never names a standard number. That is a broader claim than the two standards the other cartridges cite, and without a standard number there is nothing on the listing to check it against. Its chlorine claim, 99 percent of residual chlorine, is also the highest figure on the page.
PUR takes the other route and cites a different body. It states WQA certification to reduce lead, and separately states NSF certification to reduce microplastics, chlorine and 70 chemical and physical substances. That is the only lead reduction claim here that names the organization behind it, and PUR is also the only product on this page that is the original rather than a compatible part.
The Three Cartridges That Fit, and the One That Says Less
Compatibility Lists Almost Word for Word
iSingo, Cabiclean and Waterdrop print nearly the same list of PUR model numbers, running from the PFM and FM series through the vertical mounts, and all three name the RF9999 cartridge as the part they replace. iSingo and Cabiclean both say they fit all PUR and PUR PLUS faucet filtration systems. Anyone shopping these three is choosing between listings that describe the same fitment.
Waterdrop is narrower in one bullet and broader in another. Its compatibility bullet lists the same long model string, but an earlier bullet says for use with PUR Advanced and PUR Advanced Plus faucet mounts specifically. It is also the only cartridge that states in plain text that it is a compatible spare part and an independent brand, with the PUR names used for reference.
What Each One Says Is Inside It
AQUA CREST and Cabiclean both name coconut activated carbon, AQUA CREST as a block and Cabiclean as carbon with high filtration capacity. Those are the only two listings here that name a filter medium at all. iSingo describes a unique mineral core filtration technology and a 3 in 1 structure without saying what the core is made of. Waterdrop says revolutionized technology and nothing more.
Waterdrop is nonetheless the most candid of the four, because it is the only listing that publishes a limit: the filter cannot reduce TDS. Total dissolved solids is exactly what a buyer with hard water or a TDS meter will be hoping for, and saying so in the second bullet is more useful than any of the filtration adjectives the other three use.
Buying the Mount or Buying the Refills
The Only Product With a Size You Can Trust
PUR is the only pick whose dimension fields describe the product, 6.4 by 2.8 by 5.4 inches for the mount itself, and it matters because a faucet filter has to clear a sink. Its listing also states the only fitment warning here: it installs in minutes with no tools, fits most standard faucets, works with external aerators, and is not designed for pull out or handheld faucets.
The four cartridge listings publish package figures instead. iSingo’s and Cabiclean’s dimension fields were voided because their titles read 6 Pack, so the fields describe a carton. AQUA CREST publishes 5.12 by 2.56 by 4.72 inches for a 2 pack and Waterdrop publishes 4.92 by 5.12 by 7.68 inches for six, which are boxes rather than cartridges.
Counting Months Instead of Filters
Two of the cartridge listings do the arithmetic for you and two do not. iSingo states an 18 month value for its 6 pack and Cabiclean states 18 months of drinking water for the same count, both working from the shared 3 month replacement interval. AQUA CREST sells 2 and Waterdrop sells 6 without translating either into months.
PUR’s system ships with one filter and a change light, so it is a 3 month product with a reminder built in. None of the four cartridge listings mentions a change indicator, because the indicator lives in the mount rather than in the cartridge. If you already own the mount, you are buying months of use and nothing else.
Which One Fits Your Kitchen
The buyer with no filter yet. PUR Plus Vertical is the only complete system here, WQA certified to reduce lead and NSF certified for microplastics, chlorine and 70 substances, with a change light and a published mount size of 6.4 by 2.8 by 5.4 inches.
The household stocking up for a year and a half. iSingo states an 18 month value in a 6 pack, cites standards 42 and 372 by number, claims 70 substances reduced, and is the only cartridge naming PFAS and third party laboratory testing.
The buyer who wants a stated chlorine figure. AQUA CREST publishes up to 97.2 percent chlorine reduction from a coconut activated carbon block, cites both standards by number, and is the only listing that tells you to soak the filter for 3 minutes first.
The buyer who reads a lead claim literally. Cabiclean is the only cartridge stating that it filters out lead, alongside 99 percent of residual chlorine from coconut activated carbon. It names no standard number, and its 6 pack is quoted at 18 months.
The buyer who wants to know the limits. Waterdrop is the only pick that publishes what its filter cannot do, namely reduce TDS, and the only one stating plainly that it is an independent brand making a compatible spare part.
What We Could Not Verify
Everything above is from the listings. These are the things looked for there and not found.
- Two 6 packs publish weights of 0.65 and 1.87 pounds, so at least one package figure is wrong and none can be ranked.
- No cartridge publishes a dimension that describes the cartridge rather than its carton.
- Cabiclean cites NSF International without naming a standard, so its lead claim cannot be matched to a test.
- iSingo names PFAS and a third party laboratory without naming the laboratory or the test method.
- No listing states a flow rate in gallons per minute, which is the figure that decides how fast a tap runs through a filter.
- Only PUR publishes what faucets it will not fit, so the four cartridges leave mount compatibility to the model list.
