Waterdrop 10UA, 15UA and 10UB Replacement Filters: Which Cartridge Fits, the Gallon and Month Interval, and Why the UF and TSA Take Different Parts
Waterdrop 10UA and 10UB take the WD-RF10 (11,000 gallons or 12 months); the 15UA takes the WD-RF15 (19,000 gallons or 24 months). UF housings differ.
- Verified
- Updated
- 7 min read
- 6 sources
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Short answer
The Waterdrop 10UA and 10UB both take the WD-RF10 cartridge and the 15UA takes the WD-RF15. Waterdrop’s replacement filter page rates the RF10 at 11,000 gallons or 12 months and the RF15 at 19,000 gallons or 24 months, whichever comes first, and prints the same 0.5 micron rating and the same NSF/ANSI 42 and 372 line for both. Waterdrop says the RF10, RF15 and RF17 family is designed to fit all WD-UA/UB/UC series housings, so the spec that must match is the capacity printed on the cartridge, not the housing. The UF variants (10UA-UF, 10UB-UF) take the WD-RF10-UF, a 0.01 micron ultrafiltration cartridge with the same 11,000 gallon, 12 month rating, not a plain RF10. The three-stage Waterdrop TSA takes none of these: it uses WD-10PP, WD-10GC and WD-10CT on 6, 8 to 12 and 12 to 18 month clocks. No third-party cross-fit for the RF10 or RF15 was confirmed on a primary source this session.
Fact sheet
- Answer
- The Waterdrop 10UA and 10UB take the WD-RF10, rated 11,000 gallons or 12 months on Waterdrop’s replacement filter page; the 15UA takes the WD-RF15, rated 19,000 gallons or 24 months. The 10UA-UF and 10UB-UF take the WD-RF10-UF, a 0.01 micron ultrafiltration cartridge, and the three-stage TSA takes WD-10PP, WD-10GC and WD-10CT instead of any of them.
- Applies to
- 10UA, 15UA or 10UB (carbon), 10UA-UF or 10UB-UF (ultrafiltration), or WD-TSA-10
- Compatibility basis
- Waterdrop’s WD-RF10 / RF15 / RF17 replacement filter page, which prints the capacity and month figure for each cartridge, the 0.5 micron rating and the NSF/ANSI 42 and 372 line, and states the family is designed to fit all WD-UA/UB/UC series housings
- Assumptions
- Every certification on this page is as printed on Waterdrop’s own pages; the NSF listing database could not be queried by URL this session, so none was confirmed there.
- Waterdrop prints the same 11,000 gallon, 12 month rating for the RF10 and the RF10-UF, but the pages do not say a UF cartridge may be fitted to a plain carbon housing or the reverse, so the page lists them as separate parts.
- No third-party cross-fit cartridge for the RF10 or RF15 was found on a primary source this session; absence here is not proof that none is sold.
- Method
- Part numbers, capacities, intervals, micron ratings and standards read from six Waterdrop product pages (RF10/15/17, RF10/15/17-UF, 10UA, 10UB, TSA and TSA-UF) and cross-checked against the Amazon listing titles for the five ASINs on this page. Every figure is the maker’s published spec; nothing was tested.
- Primary source
- Waterdrop, WD-RF10 / WD-RF15 / WD-RF17 replacement filter page (11,000 / 19,000 / 24,000 gallons, 12 / 24 / 36 months, 0.5 micron, NSF/ANSI 42 and 372, fits WD-UA/UB/UC series) (manufacturer or vendor document)
- Facts verified
- Last updated
- Cite as
- OwnerSpec, "Waterdrop 10UA, 15UA and 10UB Replacement Filters: Which Cartridge Fits, the Gallon and Month Interval, and Why the UF and TSA Take Different Parts", https://ownerspec.com/water/parts/waterdrop-10ua-15ua-10ub-replacement-filters/, facts verified 12 September 2026.
Every figure above also appears, with its source, in the page below. All sources ยท How OwnerSpec verifies numbers
What fits
10UA and 10UB carbon housings: the 12 month cartridge
Waterdrop WD-RF10
11,000 gallons or 12 months, 0.5 micron, NSF/ANSI 42 and 372 per Waterdrop's page; 1 pack per the listing title
15UA, 15UB and 15UC housings: the 24 month cartridge
Waterdrop WD-RF15
19,000 gallons or 24 months, 0.5 micron, NSF/ANSI 42 and 372 per Waterdrop's page; single-unit listing
The spec people get wrong is not the micron rating, which is 0.5 on every carbon cartridge in this family, but the letters after the model number: a UF housing takes the RF10-UF, and a plain RF10 is the wrong part for it.
Which cartridge fits the 10UA, 15UA and 10UB?
Waterdrop’s naming is the key. UA is the direct-connect housing that feeds the existing faucet, UB is the same housing with its own dedicated faucet, UC is the refrigerator inline version, and the number in front is the capacity tier.
The RF10/15/17 replacement filter page says that family fits all three housings; the 10UA and 10UB system pages each name the WD-RF10 as their cartridge, and the 15UA listing names the WD-RF15.
| System | Replacement cartridge | Rated capacity | Interval | Rating | Standards (per the maker’s page) |
|---|---|---|---|---|---|
| 10UA (direct connect) | WD-RF10 | 11,000 gallons | 12 months | 0.5 micron | NSF/ANSI 42 and 372 |
| 10UB (dedicated faucet) | WD-RF10 | 11,000 gallons | 12 months | 0.5 micron | NSF/ANSI 42 and 372 |
| 15UA (direct connect) | WD-RF15 | 19,000 gallons | 24 months | 0.5 micron | NSF/ANSI 42 and 372 |
| 17UA, 17UB, 17UC | WD-RF17 | 24,000 gallons | 36 months | 0.5 micron | NSF/ANSI 42 and 372 |
| 10UA-UF, 10UB-UF | WD-RF10-UF | 11,000 gallons | 12 months | 0.01 micron ultrafiltration membrane | Not printed as a separate NSF number on the RF-UF page |
| TSA (WD-TSA-10) | WD-10PP, WD-10GC, WD-10CT | Not published in gallons | 6, 8 to 12, 12 to 18 months | Not published per stage | NSF/ANSI 42 and 372 |
| TSA-UF | WD-10PP, WD-10GC, WD-10UF | Not published in gallons | 6, 8 to 12, 12 months | Not published per stage | NSF/ANSI 372 |
The 0.5 micron figure is printed as a filtration accuracy on Waterdrop’s page without the word absolute, so read it as nominal. The 10UA page gives the system’s flow rate as 0.75 GPM, and the 10UB page gives the same 0.75 GPM at 60 psi; Waterdrop publishes no port thread size on any of the six pages read.
What else fits the same housing?
Nothing from outside Waterdrop, as far as a primary source could show this session. The alternatives below are all Waterdrop’s own.
| Alternative | Same housing? | Rating | What differs from the WD-RF10 |
|---|---|---|---|
| WD-RF15 | Waterdrop says the RF10/15/17 family fits all WD-UA/UB/UC series | 0.5 micron | 19,000 gallons and 24 months against 11,000 and 12; the pages do not say whether a 10-series housing accepts the longer cartridge |
| WD-RF17 | Same statement from Waterdrop | 0.5 micron | 24,000 gallons and 36 months; not carried on Amazon under an ASIN checked this session |
| WD-RF10-UF | Waterdrop lists it for the WD-UA/UB/UC series in the UF variants | 0.01 micron membrane | Ultrafiltration instead of a carbon block, same 11,000 gallon rating; no page read says it may go into a plain carbon housing |
| Third-party cartridges | None confirmed | Not applicable | Amazon’s search page and one cross-fit brand site could not be reached on a primary source this session, so no cross-fit is listed here |
| WD-10PP, WD-10GC, WD-10CT (TSA) | No | Not published per stage | Three separate cartridges for the WD-TSA-10 housing; they do not fit a UA or UB bracket |
If the RF10 family does not fit the cartridge you are holding, you are on the wrong page: the Waterdrop G3 and G3P800 parts page covers the reverse osmosis units, and the under-sink RO review covers the choice between a carbon block like this one and a membrane system.
How often do they need replacing?
Waterdrop’s replacement filter page gives one figure per cartridge and it is gallons or months, whichever comes first: 11,000 gallons or 12 months for the WD-RF10, 19,000 gallons or 24 months for the WD-RF15, 24,000 gallons or 36 months for the WD-RF17. The system pages themselves print only the gallon figure, so the month clock is the filter page’s number.
The 10UB page says the system can meet a tap water consumption of 22 gallons a day. At that rate the arithmetic is 11,000 divided by 22, which is 500 days, so the 12 month clock runs out before the gallon count does for a household using the filter as Waterdrop expects.
Waterdrop publishes no condition that shortens the interval: no flow-drop threshold, no sediment warning, no chlorine ceiling. The only published reference point is the 0.75 GPM at 60 psi on the 10UB page, so a noticeable drop from a fresh cartridge’s flow is the practical signal, and it is the owner’s judgement, not the maker’s rule.
On chloraminated city water, Waterdrop prints no separate capacity, so the 11,000 gallon figure is all there is.
Which cartridge to buy
The RF10 and RF15 listing titles say they reduce lead and PFAS, but Waterdrop’s own pages print only NSF/ANSI 42 and 372, and 42 covers aesthetic effects such as chlorine taste and odor. NSF/ANSI 53 and 58 are the health-effect standards, and neither appears on any Waterdrop page read this session, so if a certified lead or PFAS reduction is the reason you are filtering, this is the wrong cartridge and the under-sink filter review without RO names ones with a 53 listing.
If chlorine taste is the job and you own a 10UA or 10UB, buy the WD-RF10 ; if you own a 15UA, buy the WD-RF15 .
If your housing is labelled UF, buy neither: the RF10-UF is the listed part and it was not checked on Amazon this session.
Frequently asked questions
What replacement filter fits the Waterdrop 10UA?
The Waterdrop 10UA takes the WD-RF10 cartridge, which Waterdrop's replacement filter page rates at 11,000 gallons or 12 months, whichever comes first. The same page rates the RF10 at 0.5 micron and lists it to NSF/ANSI 42 and 372. The 10UA system page repeats the 11,000 gallon capacity and gives the system's flow rate as 0.75 GPM.
Does the Waterdrop 15UA use the same filter as the 10UA?
No. The 15UA takes the WD-RF15, which Waterdrop rates at 19,000 gallons or 24 months, against the 10UA's 11,000 gallon, 12 month WD-RF10. Waterdrop prints the same 0.5 micron rating and the same NSF/ANSI 42 and 372 line for both, and says the RF10, RF15 and RF17 family is designed to fit all WD-UA/UB/UC series housings, so the difference is capacity, not filtration.
Does the Waterdrop 10UA-UF take a different cartridge than the 10UA?
Yes. Waterdrop's RF-UF page lists the WD-RF10-UF as the replacement for the UF housings, an ultrafiltration cartridge whose membrane stops anything larger than 0.01 micron, against the 0.5 micron carbon block in the plain WD-RF10. Both carry the same 11,000 gallon, 12 month rating, but the maker's pages do not say one may be fitted to the other's housing.
Can I use a Waterdrop RF10 filter in the Waterdrop TSA system?
No. Waterdrop's TSA page lists three separate cartridges for the WD-TSA-10: the WD-10PP sediment stage every 6 months, the WD-10GC every 8 to 12 months and the WD-10CT every 12 to 18 months. The TSA-UF swaps the WD-10CT for a WD-10UF ultrafiltration stage on a 12 month clock. The single-cartridge RF10 and RF15 fit only the UA, UB and UC housings.
What NSF/ANSI certification does the Waterdrop 10UA carry?
Waterdrop's 10UA product page prints NSF/ANSI 372 and 42, and the replacement filter page prints the same two numbers for the RF10 and RF15. Neither page prints NSF/ANSI 53 or 58, which are the health-effect standards, so the lead and PFAS reduction wording on the listings is the maker's own claim. The NSF listing database was not reached this session to confirm the 42 and 372 listing.
Sources
- Waterdrop, WD-RF10 / WD-RF15 / WD-RF17 replacement filter page (11,000 / 19,000 / 24,000 gallons, 12 / 24 / 36 months, 0.5 micron, NSF/ANSI 42 and 372, fits WD-UA/UB/UC series) (manufacturer or vendor document)
- Waterdrop, WD-RF10-UF / RF15-UF / RF17-UF replacement filter page (same capacities and intervals, 0.01 micron ultrafiltration membrane, fits WD-UA/UB/UC series) (manufacturer or vendor document)
- Waterdrop, 10UA / 15UA / 17UA direct-connect under-sink system page (11,000 / 19,000 / 24,000 gallons, 0.75 GPM, NSF/ANSI 372 and 42, UF variants) (manufacturer or vendor document)
- Waterdrop, 10UB / 15UB / 17UB dedicated-faucet under-sink system page (11,000 / 19,000 / 24,000 gallons, 0.5 micron, 0.75 GPM at 60 psi, 22 gallons a day, NSF/ANSI 42 and 372) (manufacturer or vendor document)
- Waterdrop, TSA three-stage under-sink system page (WD-TSA-10, 1 GPM, WD-10PP 6 months, WD-10GC 8 to 12 months, WD-10CT 12 to 18 months, NSF/ANSI 42 and 372) (manufacturer or vendor document)
- Waterdrop, TSA-UF three-stage ultrafiltration system page (WD-10PP, WD-10GC, WD-10UF 12 months, NSF/ANSI 372) (manufacturer or vendor document)