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  2. Water Filters  >  Undersink Filters

Under-Sink Water Filters


Looking for undersink water filters for your home? Here you will find reverse osmosis water filter systems, including for tankless RO and traditional 6-stage tank RO both with remineralization media. There are also under sink water filter replacements for 3M AquaPure filter systems and inline filters, as well as under sink water filter replacement cartridge lines by 3M AquaPure, Culligan, and Pentek. Explore the quality replacement RO membrane cartridge elements by SpiroPure with a variety of gallon per day (GPD) ratings.

SpiroPure RO3

SpiroPure 1000 GPD Tankless RO System with Remineralization SP-RO1000TL

List Price: $452.00

Our Price: $271.99

Save: $180.01!
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Replace filters every 12 months

Tankless RO requires less space, and supplies more filtered RO water instantly. Easier installation and maintenance.

SpiroPure RO3-RS

SpiroPure One-Year Filter Replacement Set for Tankless Remineralization RO System SP-RO1000TL

List Price: $203.00

Our Price: $101.33

Save: $101.67!
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Replace every 12 months

The SCB (sediment, carbon, MineralPlus remineralization alkaline) cartridge and 1000 GPD RO membrane cartridge set

SP-RO100MP Remineralization

SpiroPure SP-RO100MP RO Filter System Under Sink 6-Stage with Remineralization

List Price: $318.00

Our Price: $159.00

Save: $159.00!
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No Faucet / Unbranded

6-stage under sink RO filter system with remineralization adds back lost beneficial minerals for better taste and pH

SpiroPure SP-RO100-BK

SpiroPure SP-RO100MP-BK 6-Stage Reverse Osmosis Filtration System with Faucet

List Price: $439.99

Our Price: $228.40

Save: $211.59!
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Matte Black Air Gap Faucet

6-Stage RO system with remineralization for purer drinking water and ice, cooking and food prep, humidifiers, and more

SpiroPure SP-RO100-GD

SpiroPure SP-RO100MP-GD 6-Stage Reverse Osmosis Filtration System with Faucet

List Price: $439.99

Our Price: $251.33

Save: $188.66!
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Gold Air Gap Faucet

6-Stage RO system with remineralization great for purer drinking water and ice, cooking and food prep, humidifiers, and more

SpiroPure SP-RO100-NK

SpiroPure SP-RO100MP-NK 6-Stage Reverse Osmosis Filtration System with Faucet

List Price: $439.99

Our Price: $227.25

Save: $212.74!
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Nickel Air Gap Faucet

6-Stage RO system with remineralization for purer drinking water and ice, cooking and food prep, humidifiers, and more

SpiroPure SP-RO100-CM

SpiroPure SP-RO100MP-CM 6-Stage Reverse Osmosis Filtration System with Faucet

List Price: $399.99

Our Price: $219.77

Save: $180.22!
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Chrome Air Gap Faucet

6-Stage RO system with remineralization for purer drinking water and ice, cooking and food prep, humidifiers, and more

SP-RO125MP Remineralization

SpiroPure SP-RO125MP RO Filter Replacement Set 12 Month 6-Stage with Remineralization

List Price: $99.98

Our Price: $49.99

Save: $49.99!
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Replace every 12 months

12 month replacement filter set for SP-RO100MP includes 6-stages of RO filtration including MineralPlus remineralization

Aqua-Pure 3MRO301 NSF Certified

3M Aqua-Pure 3MRO301 Reverse Osmosis Drinking Water Filtration System

List Price: $885.77

Our Price: $549.90

Save: $335.87!
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Replace filter every 12 months
3M 3MRO401 NSF Certified

3M Aqua-Pure 3MRO401 Reverse Osmosis Drinking Water Filtration System

List Price: $1,012.96

Our Price: $628.84

Save: $384.12!
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Replace filter every 12 months
Aqua-Pure 3MRO501 NSF Certified

3M Aqua-Pure 3MRO501 Pro Reverse Osmosis Drinking Water Filter System

List Price: $2,333.09

Our Price: $1,448.38

Save: $884.71!
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Replace filter every 12 months
3MFF100 NSF Certified

3M Aqua-Pure 3MFF100 Inline Full Flow Undersink Water Filter

List Price: $402.59

Our Price: $262.32

Save: $140.27!
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Replace filter every 12 months

Installed to your existing kitchen faucet

aquapure CS-FF NSF Certified

Aqua-Pure CS-FF/Cyst-FF Inline Full Flow Drinking Water Filter

List Price: $230.53

Our Price: $143.13

Save: $87.40!
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Replace filter every 6-12 months

Installed to your existing kitchen faucet

3M AP200 NSF Certified

3M Aqua-Pure AP200 Full Flow UnderSink Water Filter

List Price: $228.85

Our Price: $149.12

Save: $79.73!
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Replace filter every 6 months
Aqua-Pure FM DWS 1500

3M Water Factory Systems FaucetMATE FM DWS 1500 Drinking Water System

List Price: $253.17

Our Price: $169.92

Save: $83.25!
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Replace filter every 12 months
Aquapure Complete Cooler

3M Aqua-Pure AP Easy Complete Under-Sink Filter Complete Cooler

List Price: $214.30

Our Price: $125.40

Save: $88.90!
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Replace filter every 6-12 months
aquapure AP-DWS1000LF

Aqua-Pure AP-DWS1000LF Undersink Water Filter (No Faucet)

List Price: $613.03

Our Price: $369.48

Save: $243.55!
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Replace filter every 6-12 months

Rated #1 by a leading consumer magazine!

aquapure CS-FF NSF Certified

Aqua-Pure CS-FF/Cyst-FF Inline Full Flow Drinking Water Filter

List Price: $230.53

Our Price: $143.13

Save: $87.40!
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Replace filter every 6-12 months

Installed to your existing kitchen faucet

SpiroPure SP-RO-050R

SpiroPure SP-RO-050R RO Membrane Filter Replacement 50 GPD

List Price: $20.60

Our Price: $12.46

Save: $8.14!
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Replace every 12 months

Polyamide Thin-Film Composite membrane offers high-density enhanced filtration at a flow rate of 50 gallons per day

SpiroPure SP-RO-075R
  • 5 Stars
  • (1)

SpiroPure SP-RO-075R RO Membrane Filter Replacement 75 GPD

List Price: $20.60

Our Price: $12.51

Save: $8.09!
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Replace every 12 months

Polyamide Thin-Film Composite membrane offers high-density enhanced filtration at a flow rate of 75 gallons per day

SpiroPure SP-RO-100R

SpiroPure SP-RO-100R RO Membrane Filter Replacement 100 GPD

List Price: $25.96

Our Price: $13.93

Save: $12.03!
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Replace every 12 months

Polyamide Thin-Film Composite membrane offers high-density enhanced filtration at a flow rate of 100 gallons per day

SpiroPure SP-RO-150R

SpiroPure SP-RO-150R RO Membrane Filter Replacement 150 GPD

List Price: $36.22

Our Price: $15.49

Save: $20.73!
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Replace every 12 months

Polyamide Thin-Film Composite membrane offers high-density enhanced filtration at a flow rate of 150 gallons per day

SpiroPure SP-RO-200R

SpiroPure SP-RO-200R RO Membrane Filter Replacement 200 GPD

List Price: $50.18

Our Price: $22.30

Save: $27.88!
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Replace every 12 months

Polyamide Thin-Film Composite membrane offers high-density enhanced filtration at a flow rate of 200 gallons per day

SpiroPure SP-RO-300R

SpiroPure SP-RO-300R RO Membrane Filter Replacement 300 GPD

List Price: $55.72

Our Price: $23.77

Save: $31.95!
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Replace every 12 months

Polyamide Thin-Film Composite membrane offers high-density enhanced filtration at a flow rate of 300 gallons per day

SpiroPure SP-RO-400R
  • 5 Stars
  • (1)

SpiroPure SP-RO-400R RO Membrane Filter Replacement 400 GPD

List Price: $56.00

Our Price: $24.39

Save: $31.61!
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Replace every 12 months

Polyamide Thin-Film Composite membrane offers high-density enhanced filtration at a flow rate of 400 gallons per day

Culligan RC-EZ-4 NSF Certified
  • 5 Stars
  • (4)

Culligan RC-EZ-4 Drinking Water Filter Replacement Cartridge (Level 4 Premium Filtration)

List Price: $81.66

Our Price: $54.44

Save: $27.22!
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Replace every 6 months
Culligan RC-EZ-3 NSF Certified
  • 5 Stars
  • (1)

Culligan RC-EZ-3 Drinking Water Filter Replacement Cartridge (Level 3 Advanced Filtration)

List Price: $46.07

Our Price: $30.71

Save: $15.36!
VIEW DETAILS
Replace every 6 months
Culligan RC-EZ-1 NSF Certified
  • 4.5 Stars
  • (2)

Culligan RC-EZ-1 Drinking Water Filter Replacement Cartridge (Level 1 Basic Filtration)

List Price: $25.44

Our Price: $16.96

Save: $8.48!
VIEW DETAILS
Replace every 12 months
Culligan 1000R NSF Certified
  • 5 Stars
  • (16)

Culligan 1000R Filter Replacement Cartridge (Level 3 Advanced Filtration)

List Price: $56.99

Our Price: $37.99

Save: $19.00!
VIEW DETAILS
Replace every 6 months
Culligan D-40A NSF Certified
  • 4.5 Stars
  • (4)

Culligan D-40A Drinking Filter Replacement Cartridge (Level 4 Premium Filtration)

List Price: $60.93

Our Price: $40.62

Save: $20.31!
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Replace every 6 months
Culligan D-30A NSF Certified
  • 5 Stars
  • (9)

Culligan D-30A Drinking Filter Replacement Cartridge (Level 2 Extra Filtration)

List Price: $29.57

Our Price: $19.71

Save: $9.86!
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Replace every 12 months
Culligan D-20A NSF Certified
  • 5 Stars
  • (7)

Culligan D-20A Drinking Filter Replacement Cartridge (Level 1 Basic Filtration)

List Price: $16.41

Our Price: $10.94

Save: $5.47!
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Replace every 12 months
Culligan D-10 NSF Certified
  • 5 Stars
  • (1)

Culligan D-10A Drinking Filter Replacement Cartridge (2 Pack)

List Price: $20.15

Our Price: $13.43

Save: $6.72!
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Replace every 3 months
Culligan D-250A

Culligan D-250A Drinking Filter Replacement Cartridge Set (Level 4 Premium Filtration)

List Price: $68.27

Our Price: $45.51

Save: $22.76!
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Replace every 6 months
3MFF101 NSF Certified
  • 5 Stars
  • (6)

3M Aqua-Pure 3MFF101 Filter Replacement Cartridge

List Price: $316.32

Our Price: $206.11

Save: $110.21!
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Replace every 12 months
3MDW311 NSF Certified

Aqua-Pure 3MDW311 Filter Replacement Cartridge

List Price: $400.74

Our Price: $179.73

Save: $221.01!
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Replace every 12 months
aquapure c-complete NSF Certified
  • 5 Stars
  • (11)

Aqua-Pure C-Complete Replacement Cartridge

List Price: $128.43

Our Price: $83.69

Save: $44.74!
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Replace every 6-12 months
aquapure AP-DW8090 NSF Certified
  • 5 Stars
  • (1)

Aqua-Pure AP-DW80/90 Replacement Cartridge

List Price: $221.63

Our Price: $144.42

Save: $77.21!
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Replace every 6-12 months
aquapure c-cyst-ff NSF Certified
  • 5 Stars
  • (2)

Aqua-Pure C-Cyst-FF Replacement Cartridge

List Price: $147.41

Our Price: $96.04

Save: $51.37!
VIEW DETAILS
Replace every 6-12 months

For Cyst-FF Inline Drinking Water Filter

aquapure C-CS-FF NSF Certified
  • 5 Stars
  • (2)

Aqua-Pure C-CS-FF Replacement Cartridge

List Price: $89.90

Our Price: $58.58

Save: $31.32!
VIEW DETAILS
Replace every 6-12 months

For CS-FF Inline Drinking Water Filter

Aqua-Pure AP217 NSF Certified

3M Aqua-Pure AP217-2PK Replacement Cartridge

List Price: $140.06

Our Price: $91.26

Save: $48.80!
VIEW DETAILS
Replace every 6 months
Aqua-Pure 3MROP416 NSF Certified

3M Aqua-Pure 3MROP416 Replacement Carbon Block Post Water Filter

List Price: $63.71

Our Price: $42.76

Save: $20.95!
VIEW DETAILS
Replace every 12 months
3M FM 1500 NSF Certified

3M CUNO Water Factory FaucetMATE FM 1500 CTG Replacement Carbon Filter

List Price: $122.35

Our Price: $79.34

Save: $43.01!
VIEW DETAILS
Replace every 12 months
3M AP517

3M Aqua-Pure AP517 Undersink Drinking Water Replacement Cartridge

List Price: $130.21

Our Price: $87.99

Save: $42.22!
VIEW DETAILS
Replace every 6 months
3M APDW85 NSF Certified

3M Aqua-Pure APDW85 Undersink Replacement Water Filter Cartridge

List Price: $102.94

Our Price: $69.08

Save: $33.86!
VIEW DETAILS
Replace every 6 months
Aqua-Pure 3MROP411 NSF Certified

3M Aqua-Pure 3MROP411 Replacement Sediment Prefilter

List Price: $49.90

Our Price: $33.49

Save: $16.41!
VIEW DETAILS
Replace every 12 months
3M 3MROP310 NSF Certified

3M Aqua-Pure 3MROP310 Replacement Sediment / Carbon Water Prefilter

List Price: $52.68

Our Price: $34.16

Save: $18.52!
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Replace every 12 months
3M 3MROM413 NSF Certified

3M Aqua-Pure 3MROM413 Replacement Drinking Water Filter Cartridge

List Price: $309.97

Our Price: $208.03

Save: $101.94!
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Replace every 36 months
Aqua-Pure 3MROP412 NSF Certified

3M Aqua-Pure 3MROP412 Granulated Carbon Replacement Water Filter

List Price: $72.07

Our Price: $48.36

Save: $23.71!
VIEW DETAILS
Replace every 12 months
Pentek P-250A
  • 5 Stars
  • (1)

Pentek P-250A / 155832-44 Filter Replacement Cartridge Set for US-1000

List Price: $50.72

Our Price: $33.81

Save: $16.91!
VIEW DETAILS
Replace every 6 months
Pentek QC10-CBRR

Pentek QC10-CBRR / 155785-43 Enhanced Carbon Block Replacement Filter

List Price: $43.52

Our Price: $29.01

Save: $14.51!
VIEW DETAILS
Replace every 6 months
GE FQK2J NSF Certified

GE FQK2J Dual Flow Drinking Water Replacement Filter Set

List Price: $69.99

Our Price: $47.99

Save: $22.00!
VIEW DETAILS
Replace every 6 months

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