Watts Premier 500023 WP-5 Five Stage Reverse Osmosis System

 Model# WP-5.  Item Number 500023

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The Watts Premier WP-5 (500023) Reverse Osmosis System is innovative in its one piece manifold design, thereby providing a seamless water path, effectively eliminating 17 different connections.  It is a 5 stage reverse osmosis system that is certified to industry Standard with the reduction of the claims specified on the performance data sheet.  The WP-5 System begins with stage 1, a five micron Sediment filter that traps particulate matter like dirt, rust, and silt that will affect the taste and appearance of your water.  Stage 2 is a five micron Carbon Block filter that provides a reduction of chlorine and other materials that cause bad taste and odors.  Stage 3 is an additional five micron Carbon Block filter which provides a greater reduction of chlorine (these are called PRE-filters because they filter in front of the reverse osmosis membrane).   Stage 4 is the heart of the reverse osmosis system, the RO Membrane. This semi permeable membrane will effectively reduces TDS (total dissolved solids), Sodium and a wide range of contaminants such as Percolate, Chromium, Arsenic, Copper and Lead. It will also remove over 99.95% cysts such as Giardia and Cryptosporidium.  Stage 5 is a high quality GAC final filter (this is called a final filter because it filters after the membrane).  This final filter is a polishing filter and is used in the last stage of filtration. 

  • Reverse osmosis filtration system
  • 3-gallon storage tank
  • Chrome air-gap faucet
  • 5 stages of filtration
  • Adapt-A-Valve Water shut off valve
  • MFG Brand Premier
  • MFG Model # WP-5
  • MFG Part # 500023
  • Certified to NSF/ANSI 58 Certified Reverse Osmosis Units
  • California Certification 00-1452
  • Certified by WQA
  • 3 Year Warranty 

Reduction Claims Validated for this unit by WQA:

  • Barium
  • Cadmium
  • Copper
  • Cyst
  • Fluoride
  • Hexavalent Chromium
  • Lead
  • Pentavalent Arsenic <= 300 ppb reduction
  • Radium 226/228
  • Selenium
  • TDS
  • Trivalent Chromium
  • Turbidity

* This product is intended for use only on water supplies that have been shown to be at or below the referenced concentration and valency of arsenic.

Filtration Stages

  • Filter Stage 1 - 5 Micron Sediment Filter 
                           - Reduces Dirt, Sand and Rust
  • Filter Stage 2 - 5 Micron Carbon Block Filter
                           - Reduces Chlorine, Objectionable Tastes and Odor.
  • Filter Stage 3 - 5 Micron Carbon Block Filter
                           - Reduces Chlorine, Objectionable Tastes and Odor.
  • Filter Stage 4 - 24 GPD (gallons per day) Membrane
                          - High production thin film composite membrane.
  • Filter Stage 5 - Carbon Inline Post filter
                          - Enhance the water’s taste.

Replacement Filters:

Stage 1:  Changed Every 6 months
(1) 5 Micron Sediment filter (104017)

Stage 2 & 3: Changed Every 6 months
(2) 5 Micron Carbon Block filters (101009

Stage 4: Changed Every 2-5 years
WP5: (1) 24 GPD Membrane (560014) ** 
622052 250mL Flow Restrictor

Stage 5: Changed Every 12 months
(1) 10” Inline Final Filter (560010)

NOTE:  WP5-50 USES (1)  50 GPD Membrane 560018 
622055 500mL Flow Restrictor
Filter Kits:

6 Month Filter Kit
• (1) 5 Micron Sediment Filter
• (2) 5 Micron Carbon Block filters

Premium Plus Filter Kit
• (1) 5 Micron Sediment Filter
• (2) 5 Micron Carbon Block filters
• (1) 10" Inline Final Filter
• (1) Wrench

7-Pack Deluxe Replacement Kit
• (2) 5 Micron Sediment Filters
• (4) 5 Micron Carbon Block Filters
• (1) 10" Inline Final Filter

**Optional RO Membrane Upgrades:

Please Note: RO Membranes Not Included in any kits



Assembled Depth (in.)  6.0
Assembled Width (in.)  16.0 
Assembled Height (in.)  16.0
Unit Color/Finish  White Filter Housings 
Automatic shutoff  Yes
Filter change indicator  No
Faucet Included  Yes
Faucet Color Chrome
Filtration method  Reverse Osmosis 
Fitting size (in.)  1/4 in
Fitting style  Quick connect 
Installation kit included  Yes
Item Package Type  Cardboard Container 
Maximum feed water pressure (psi)  100
Minimum feed water pressure (psi)  40
Maximum feed water temperature (F) ,(C) 100° , 37.8°
 Minimum feed water temperature (F), (C) 40° , 4.5°
Maximum filtered water flow (gallons per day.) 24
Product Depth (in.)  6
Product Width (in.)  16
Product Height (in.)  16
Product Weight (lb.)  23
Number of stages  5
Water Filtration System Type  Under Sink
Water Filtration Technology Reverse Osmosis
NSF Listed Yes
Manufacturer Warranty  3 year limited warranty 


Note: Recommended hardness not to exceed 10 grains per gallon, or 170ppm. System will operate with hardness over 10 grains but the membrane life may be shortened. Addition of a water softener may lengthen the membrane life.

The operating pressure in your home should be tested over a 24 hour period to attain the maximum pressure. If it is above 100 psi then a pressure regulator will be required.


Additional Information

Installation Instructions

Troubleshooting guide

Replacement Filters



3 Year Warranty.  For additional warranty information on this product, please visit our online store support pages or call our Customer Service Center at 1-800-752-5582


Shipping Options

Most orders ship within 3 business days


Weight: 24.0 lb

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