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Water Doctors best reverse osmosis system with three filters, the reverse osmosis membrane, and a five gallon storage tank

The Best Reverse Osmosis System Provides Pure Water For Less

Water Doctors Custom Engineered PRO-4000RO Purifier uses Reverse Osmosis Technology to provide 99.999% pure drinking water right at your kitchen sink.  The PRO-4000RO will supply your family with 1,500 gallons a month of odor and taste-free water, all for a fraction of the cost of bottled water.


  • Custom Engineered to end user: Yes
  • TDS Removal (total purity): up to 99%
  • Heavy Metals Removal: Yes  
  • Taste & Odor Removal: Yes
  • Sanitary Quick Change Filters: Yes
  • Filter Life Expectancy: 12 to 18 months
  • Annual filter expense: $96.00   
  • Warranty (When installed by WATER DOCTORS): 
  • 1 year parts/excluding filters   
  • Standard Faucet Included: Bright Chrome


button link Download the Pro-4000RO PDF


Learn more about Reverse Osmosis
How an RO System can improve your drinking water experience