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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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
Replace every 12 months
3MDW311 NSF Certified
Aqua-Pure 3MDW311 Filter Replacement Cartridge
List Price: $400.74

Our Price: $179.73

Save: $221.01!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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!
VIEW DETAILS
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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