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Kohler Aquifer Under-Sink Water Purification System

Model K-200
4.4/5 from 489 ratings
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Tank
3 gallons pressurized
Stages
6 (sediment + 2x carbon pre + RO + carbon post + UV)
Warranty
3 years
Connections
1/4" push-fit
Tds Reduction
Up to 96%
Certifications
NSF 42, NSF 53, NSF 58

Kohler Aquifer Under-Sink Water Purification System Review

The Kohler Aquifer K-200 is a 6-stage undersink water purification system that combines reverse osmosis filtration with UV sterilization for comprehensive drinking water treatment. Stage 1 is a 5-micron polypropylene sediment pre-filter. Stages 2 and 3 are granular activated carbon and carbon block pre-filters removing chlorine and organics before the membrane. Stage 4 is a 100 GPD TFC reverse osmosis membrane. Stage 5 is a post-carbon polishing filter. Stage 6 is a UV-C sterilization stage that inactivates 99.99% of bacteria and viruses in the RO permeate before it enters the 3-gallon pressurized storage tank. Purified water is dispensed through the Kohler Aquifer dedicated faucet, available in all standard Kohler kitchen faucet finishes (polished chrome, brushed nickel, matte black, vibrant brushed moderne brass). The Aquifer integrates into the Kohler ecosystem -- the Aquifer dispensing faucet is designed to match the aesthetic of Kohler Simplice, Bellera, and Artifacts kitchen faucets for a coordinated kitchen installation.
Pros
  • UV sterilization adds microbial protection on top of RO
  • 100 GPD production rate is above average for under-sink RO
  • Kohler finish options coordinate with existing kitchen faucet collection
  • NSF 42, 53, and 58 tri-certification
Cons
  • UV lamp requires annual replacement ($25-40)
  • 3-year warranty shorter than premium competitors
  • Higher upfront cost than non-UV RO systems

Full Specifications

Brand
Kohler
Model Number
K-200
Tank
3 gallons pressurized
Stages
6 (sediment + 2x carbon pre + RO + carbon post + UV)
Warranty
3 years
Connections
1/4" push-fit
Tds Reduction
Up to 96%
Certifications
NSF 42, NSF 53, NSF 58
Faucet Finishes
Polished chrome, brushed nickel, matte black, and more
Production Rate
100 GPD
Uv Sterilization
99.99% bacteria and virus inactivation

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