Bosch UltraClarity Water Filter (BORPLFTR10 / REPLFLTR10 / 644845)

OEM part number(s):

BORPLFTR10BORPLFTR30REPLFLTR10REPLFLTR301103415264484500644845RA450010RA45002117005585

Made by Bosch (BSH). Replacement interval: 6 months.

Exact fit — verified

Fits 19 models

Across 3 brand(s): Bosch, Fisher & Paykel, Thermador. Examples: B18IF900SP, B20CS30SNS/01, B20CS30SNS/02, B21CT80SNS, B21CT80SNS/01, B21CT80SNS/02, B22CS30SNS, B22CS50SNW/05, B22CS80SNS, B26FT70SNS, B36IT71NNP/11, B36IT71NNP/12, T181F900SP/11, T18ID80NLP/49… — the complete verified fit list is on this page.

Cross-brand equivalents

5 verified equivalent(s): Thermador REPLFLTR10; Gaggenau RA450010; Bosch (legacy Cuno/3M) 9000077104; Filters Fast PH21700; ClearChoice CLCH124 — full table below.

Maker claims NSF/ANSI 42, NSF/ANSI 53 — no independent certifier listing was found when checked on 2026-11-11. Treat the claim as unverified.

Prices checked 2026-11-11: genuine from $49.00 + shipping at Bosch Home (bosch-home.com) · aftermarket from $24.95 + shipping at FiltersFast. Every price in the table below carries its store and checked date.

Buy on Amazon — BORPLFTR10

Amazon is a buy link, not a price claim: Amazon blocks automated price reads, so its price is never quoted here.

Exact fit — all 19 verified models

Harvested from published manufacturer and retailer fit lists (sources at the bottom of this page). If your exact model is not listed, do not assume fit — check the number on your current part.

Bosch (9)

B18IF900SP

B20CS30SNS/01

B20CS30SNS/02

B21CT80SNS

B21CT80SNS/01

B21CT80SNS/02

B22CS50SNW/05

B36IT71NNP/11

B36IT71NNP/12

Fisher & Paykel (3)

B22CS30SNS

B22CS80SNS

B26FT70SNS

Thermador (7)

T181F900SP/11

T18ID80NLP/49

T18IF70NSP/04

T18IF900SP/11

T301F900SP/03

T30IB900SP/03

T36BT920NS/11

PARTIAL LIST: fit_models are the complete Compatible Models list published on the FiltersFast genuine-OEM page (24 entries) opened 2026-11-11. Bosch's own product page publishes no model list (compatibility checker only). Capacity conflict noted in rated_capacity - do not publish a single capacity without resolving 240 gal (DiscountFilters) vs ~740 gal (AllFilters/BSH-family copy). 644845 and REPLFLTR20: 644845 is NOT a distinct cartridge - it is an alternate number for this same UltraClarity cartridge (Bosch-home, DiscountFilters and FiltersFast all treat 644845 = BORPLFTR10/REPLFLTR10). No verifiable distinct REPLFLTR20 cartridge was found; REPLFLTR20 appears only as Thermador marketing shorthand for the UltraClarity family - see notes/rejections.

Certification

Maker claims NSF/ANSI 42, NSF/ANSI 53 — no independent certifier listing was found when checked on 2026-11-11. Treat the claim as unverified.

Retailer/manufacturer copy states 'Tested by NSF International against Standard 42 for chlorine taste/odor and particulate and Standard 53 for lead, cysts, turbidity' (DiscountFilters OEM page, opened) and AllFilters states certified in systems 9000077095/9000077096. No NSF directory (info.nsf.org) listing was opened in this pass, so status is manufacturer_claimed, not certified.

Aftermarket equivalents

Brand	Part number	Note
Thermador	REPLFLTR10	Same BSH cartridge sold under Thermador brand number; also 00740570 / 740560 family
Gaggenau	RA450010	Same BSH cartridge under Gaggenau brand number
Bosch (legacy Cuno/3M)	9000077104	Legacy system/cartridge numbering for same UltraClarity platform; systems 9000077095 / 9000077096
Filters Fast	PH21700	Aftermarket house-brand replacement sold at FiltersFast
ClearChoice	CLCH124	Aftermarket replacement sold at DiscountFilters; IAPMO NSF/ANSI 42 claim for CLCH124-S system per DiscountFilters copy

All verified prices

Kind	Store	Pack	Price	Shipping	Checked
Genuine OEM	Bosch Home (bosch-home.com)	1-pack	$49.00 + shipping item $49.00	Listed $49.00, shown Out of Stock on manufacturer page; shipping charge not published on product page, so shipped total not stated	2026-11-11
Aftermarket	FiltersFast	1-pack	$24.95 + shipping item $24.95	FiltersFast PH21700 aftermarket. Free economy shipping only on US orders over $99 (lower 48); single-filter order does not qualify and checkout shipping fee is not published on the product page, so shipped total not stated	2026-11-11
More prices	DiscountFilters	1-pack	$69.95 + shipping item $69.95	Genuine OEM at DiscountFilters. Orders over $70 ship free; $69.95 single is just under threshold, shipping fee not published, so shipped total not stated	2026-11-11
More prices	FiltersFast	1-pack	$64.95 + shipping item $64.95	Genuine OEM 644845 at FiltersFast ($59.95 ea at 3+). Free shipping only over $99, so shipped total not stated	2026-11-11
More prices	Home Depot	1-pack	$41.20 + shipping item $41.20	BORPLFTR30 listing at Home Depot; shipping/pickup terms not confirmed on fetched page, so shipped total not stated	2026-11-11
More prices	DiscountFilters	1-pack	$29.95 + shipping item $29.95	ClearChoice CLCH124 aftermarket. Orders over $70 ship free; single does not qualify, so shipped total not stated	2026-11-11

Manufacturer store is cheapest OEM list price ($49) but was Out of Stock at check; cheapest in-stock OEM found was Home Depot $41.20 (BORPLFTR30). Best aftermarket list price: FiltersFast PH21700 $24.95. No shipped totals quoted where shipping was threshold- or checkout-dependent.

Specs

Dimensions	8.25 in L x 2.0 in Dia. (DiscountFilters); FiltersFast/AllFilters list 8-1/4 in x 2 in
Rated capacity	240 gallons per DiscountFilters spec block; other BSH/retailer copy lists up to 739-750 gal / 2,800 L for the same platform - figures conflict across sources, see fit_note
Flow rate	0.75 GPM
Replacement interval	6 months
Quantity note	Single cartridge; Bosch also sells 3-pack 11048053 at $151.99 on bosch-home.com
Certification (detail)	Retailer/manufacturer copy states 'Tested by NSF International against Standard 42 for chlorine taste/odor and particulate and Standard 53 for lead, cysts, turbidity' (DiscountFilters OEM page, opened) and AllFilters states certified in systems 9000077095/9000077096. No NSF directory (info.nsf.org) listing was opened in this pass, so status is manufacturer_claimed, not certified.