531417 - RO Pure Plus Guide

Product Manual (PDF)

Watts Premier has many different options for you when it comes to replacing your Filters. We offer the Filters individually or in Filter Kits in order to fit your needs. See all of the different stages below for your RO Pure Plus Reverse Osmosis System to help you locate the Filter or Filter Kit you are looking for.

  • Individual Stages of Your RO Pure Plus Reverse Osmosis System

    Stage #1 - Five Micron Sediment Filter (105311) that traps sediment and other particulate matter like dirt, silt and rust which affect the taste and appearance of your water. Note - Recommended Change Every 6 Month.

    Stage #2 - Five Micron Carbon Block Filter (105351) which helps ensure that chlorine and other materials that cause bad taste and odor are greatly reduced. Note - Recommended Change Every 6 Month.

    Stage #3 - 50 GPD (Gallons Per Day) RO Membrane (105331) the heart of the Reverse Osmosis System. This semi permeable membrane will effectively remove TDS, Sodium and a wide range of contaminants such as Chromium, Arsenic, Copper, Lead as well as Cysts, such as Giardia and Cryptosporidium. Because the process of extracting this high quality drinking water takes time, your RO water treatment system is equipped with a storage tank. Note - Recommended Change Every 2 to 5 Years depending on your water quality.

    Stage #4 - VOC (Volatile Organic Compound) Carbon Block Filter (105381). Through the specialty (VOC) like MTBE’s, Atrazine, Benzene, 2,4-D,Lindane and others from your drinking water. It is estimated that VOC’s are present in one-fifth of the nation’s water supplies. These water contaminants can enter ground water from a variety of sources including localized use of herbicides and pesticides, gasoline or oil spills, leaking underground fuel tanks, septic system cleaners, and chemicals used in the dry-cleaning industry. Premier RO-Pure Plus system conforms to NSF/ANSI 58 for VOC reduction. See performance data sheet for individual contaminants and reduction performance. Note - Recommended Change Every 12 Months.

  • Filter Kits Without Membrane

    Bi-Annual Filter Kit - 531102 - This kit contains one sediment Filter (105311) and one Pre-Carbon Filter (105351).

    Annual Filter Kit - 531109 - This kit contains two Sediment Filters, (105311), two Pre-Carbon Filters (105351) and one VOC Carbon Block Filter (105381).

  • Filter Kits With Membrane

    Four Pack Filters - 531160 - This kit contains one Sediment Filter (105311), one Pre-Carbon Filter (105351), one VOC Carbon Block Filter (105381) and one 50 GPD Membrane (105331).

    Six Pack Filters - 531161 - This kit contains two Sediment Filters (105311), two Pre-Carbon Filters (105351), one VOC Carbon Block Filter (105381) and one 50 GPD Membrane (105331).

Your Systems Operating Parameters and System Diagram will help you keep your Reverse Osmosis functioning to it fullest capacity. If you have any questions you can contact us at 1-800-752-5582 or email us at WeCare@WattsWater.com and we will get back with you as soon as possible.

  • Operational Parameters

    Hardness - Recommended hardness not to exceed 10 grains per gallon, or 170 parts per million. 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.

    Water Pressure - The operating water pressure in your home should be tested over a 24 hour period to attain the maximum pressure. If the incoming water pressure is above 100 psi then a water pressure regulator is required. A booster pump is needed for incoming water pressure under 40psi.

    Copper Tubing - Reverse Osmosis water should not be run through copper tubing as the purity of the water will leach copper causing an undesired taste in water and pin holes may form in the tube.

Parameter Minimum Maximum
Operating Temperatures: 40°F (4.4°C) 100°F (37.8°C)
Operating Pressure: 40 psi (2.80 kg/cm2) 100 psi (7.0 kg/cm2)
pH Parameters: 2 11
Iron: N/A 0.2 ppm
TDS (Total Dissolved Solids): N/A <1800 ppm
Turbidity: N/A <5NTU
Hardness N/A 10 Grains Per Gallon


  • System Diagram

Watts Premier RO Pure Plus System Diagram

Diagram Number Part Number Description
1 115304 Filter Lid
2 134003 Automatic Shut-Off Valve
3 119007 Storage Tank - 3 Gallons
4 560080 Adapt-A-Valve Kit
5 116187 Top Mount Twist Faucet
6 134018 Tank Valve - ¼F x ¼" QC
7 134018 Drain Saddle
8 142000 ¼" Green Tubing with 90° bend - 4'
9 142001 ¼" Blue Tubing with 90° bend - 4'
10 105331 ⅜ Black Tubing - 3' X 1
11 142002 ¼" Red Tubing with 90° bend - 4'
13 105311 Sediment Pre-Filter (Red)
14 105351 Carbon Pre-Filter (Yellow)
15 105331 Membrane 50 GPD (Green)
16 105381 VOC Carbon Post Filter (Silver)

Watts Premier has laid out every contaminant which is reduced by your RO Pure Plus Reverse Osmosis System. If you can't find the information you are looking for our tech support agents will assist you. You can contact us at 1-800-752-5582 or email us at WeCare@WattsWater.com and we will get back with you as soon as possible.

Note - Depending on water chemistry, water temperature, and water pressure Premier’s R.O. Systems production and performance will vary.

  • Performance Data Sheet

Substance % Reduction Inf. Challenge Concentration (mg/L Unless Specified) Max. Allowable Concentration (mg/L Unless Specified)
Arsenic (Pentavalent) 99.6% 0.30 ± 10% 0.010 mg/L
Barium Reduction 99.0% 10.0 ± 10% 2.0
Cadmium Reduction 98.0% 0.3 ± 10% 0.005
Chromium (Hexavalent) 99.0% 0.03 ± 10% 0.1
Chromium (Trivalent) 99.0% 0.03 ± 10% 0.1
Copper Reduction 99.0% 3.0 ± 10% 1.3
Cysts 99.99% minimum 50,000/mL N/A
Fluoride Reduction 97.0% 8.0 ± 10% 1.5
Lead Reduction 98.8% 0.15 ± 10% 0.0107
Radium 226/228 80.0% 25pCiL ± 10% 5 pCiL
Selenium 97.0% 0.10 ± 10% 0.05
TDS 95.0% 750 ± 40mg/L 187
Turbidity 99.0% 11 ± 1mg/L 0.5 NTU
Alchlor >98.0% 0.05 0.001
Artazine >97.0% 0.1 0.003
Benzene >99.0% 0.081 0.001
Bromodichloromethane (TTHM) >99.8% 0.03 ± 10% 0.015
Bromoform (TTHM) >99.8% 0.300 ± 0.30 0.015
Carbofuran (Furadan) >99.0% 0.19 0.001
Carbon Tetrachloride 98.0% 0.078 0.0018
Chlorobenzene (Monochlorobenzene) >99.0% 0.077 0.001
Chloroform (TTHM) >99.8% 0.300 ± 0.30 0.015
Chloropicrin 99.0% 0.015 0.0002
2,4-D 98.0% 0.110 0.0017
DBCP (See Dibromochoropropane) >99.0% 0.052 0.00002
1,2-DCA (See Dichloroethane) 95.0% 0.088 0.0048
1,1- DCE (See 1,1-Dichloroethylene) >99.0% 0.083 0.001
Dibromochloromethane (TTHM:Chlorodibromomethane) >99.8% 0.300 +/- 0.30 0.015
Dibromochloropropane (DBCP) >99.0% 0.052 0.00002
o-Dichlorobenzene (1,2 Dichlorobenzene) >99.0% 0.08 0.001
p-Dichlorobenzene (para-Dichlorobenzene) >98.0% 0.04 0.001
1,2-Dichloroethane (1,2-DCA) 95.0% 0.088 0.0048
1,1-Dichloroethylene (1,1- DCE) >99.0% 0.083 0.001
CIS-1,2-Dichloroethylene >99.0% 0.17 0.0005
Trans-1,2-Dichloroethylene >99.0% 0.086 0.001
1,2-Dichloropropane (Propylene Dichloride) >99.0% 0.08 0.001
CIS-1,3-Dichloropropylene >99.0% 0.079 0.001
Dinoseb 99.0% 0.17 0.0002
EDB (See Ethylene Dibromide) >99.0% 0.044 0.00002
Endrin 99.0% 0.053 0.0059
Ethylbenzene >99.0% 0.088 0.001
Ethylene Dibromide (EDB) >99.0% 0.044 0.00002
Furadan (See Carbofuran) >99.0% 0.19 0.001
Bromochloroacetonitrile 98.0% 0.022 0.0005
Dibromoacetonitrile 98.0% 0.024 0.0006
Dichloroacetonitrile 98.0% 0.0096 0.0002
Trichloroacetonitrile 98.0% 0.015 0.0003
1,1-Dichloro-2-Propanone 99.0% 0.0072 0.0001
1,1,1-Trichloro-2-Propanone 96.0% 0.0082 0.0003
Heptachlor >99.0% 0.25 0.00001
Heptachlor Epoxide 98.0% 0.0107 0.0002
Heptachlorobutadiene (Perchlorobutadiene) >98.0% 0.044 0.001
Hexachlorocyclopentadiene >99.0% 0.060 0.000002
Lindane >99.0% 0.055 0.00001
Methoxychlor >99.0% 0.050 0.0001
Methylbenzene (See Toluene) >99.0% 0.078 0.001
Monochlorobenzene (See Chlorobenzene) >99.0% 0.77 0.001
PCE (See Tetrachloroethylene) >99.0% 0.081 0.001
Pentachlorophenol >99.0% 0.096 0.001
Perchlorobutadiene (See Hexachlorobutadiene) >98.0% 0.044 0.001
Propylene Dichloride (See 1,2-Dichloropropane) >99.0% 0.080 0.001
Simazine >97.0% 0.120 0.004
Silvex (See 2,4,5-TP) 99.0% 0.270 0.0016
Styrene (Vinylbenzene) >99.0% 0.15 0.0005
1,1,1-TCA (See 1,1,1 - Trichloroethane) 95.0% 0.084 0.0046
TCE (See Trichloroethylene) >99.0% 0.180 0.0010
1,1,2,2 - Tetrachloroethane >99.0% 0.081 0.001
Tetrachloroethylene >99.0% 0.081 0.001
Toluene (Methylbenzene) >99.0% 0.078 0.001
2,4,5-TP (Silvex) 99.0% 0.270 0.0016
1,2,4 Trichlorobenzene (Unsymtrichlorobenzene) >99.0% 0.160 0.0005
1,1,1-Trichloroethane (1,1,1-TCA) 95.0% 0.084 0.0046
1,1,2-Trichloroethane >99.0% 0.150 0.0005
Trichloroethylene (TCE) >99.0% 0.180 0.0010
Trihalomethanes (TTHM) >99.8% 0.300 +/- 0.30 0.015
Unsym-Trichlorobenzene (see 1,2,4- Trichlorobenzene) >99.0% 0.160 0.0005
Vinylbenzene (see Styrene) >99.0% 0.150 0.0005
Xylenes (Total) >99.0% 0.070 0.001
  • Arsenic Fact Sheet

    Arsenic (As) is a naturally occurring contaminant found in many ground waters. Arsenic in water has no color, taste or odor. It must be measured by an arsenic test kit or lab test.

    Public water utilities must have their water tested for arsenic. You can obtain the results from your water utility contained within your consumer confidence report. If you have your own well, you will need to have the water evaluated. The local health department or the state environmental health agency can provide a list of test kits or certified labs.

    There are two forms of arsenic: pentavalent arsenic (also called As (V), As (+5)) and trivalent arsenic (also called As (III), As (+3)). In well water, arsenic may be pentavalent, trivalent, or a combination of both. Although both forms of arsenic are potentially hazardous to your health, trivalent arsenic is considered more harmful than pentavalent arsenic. RO systems are very effective at removing pentavalent arsenic. Free chlorine residual will rapidly convert trivalent arsenic to pentavalent arsenic. Other water treatment chemicals such as ozone and potassium permanganate will also change trivalent arsenic to pentavalent arsenic. A combined chlorine residual (also called chloramine) where it does convert trivalent arsenic to pentavalent arsenic, may not convert all the trivalent arsenic in to pentavalent arsenic. If you get your water from a public water utility, contact the utility to find out if free chlorine or combined chlorine is used in the water system.

    This Watts Premier Reverse Osmosis System is designed to remove up to 98% of pentavalent arsenic. It will not convert trivalent arsenic to pentavalent arsenic. Under laboratory standard testing conditions, this system reduced 0.30 mg/L (ppm) pentavalent arsenic to under 0.010 mg/L (ppm) (the USEPA standard for drinking water). Actual performance of the system may vary depending on specific water quality conditions at the consumer’s installation. In addition to the independent laboratory standard testing conditions, Watts Premier has conducted additional field testing on our Reverse Osmosis Systems to determine trivalent arsenic reduction capabilities. Based upon Watts Premier's field testing, it has been determined that the RO units are capable of reducing up to 67% of trivalent arsenic from the drinking water.

    This Reverse Osmosis System contains a replaceable component critical to the efficiency of the system. Replacement of the reverse osmosis component should be with one of identical specifications, as defined by the manufacturer, to ensure the same efficiency and contaminant reduction performance.


Watts Premier's 1 Year Warranty is meant to protect our customers from any unexpected defects in workmanship (excluding Filters and Membranes). If you have any questions regarding your warranty you can contact us at 1-800-752-5582 or email us at WeCare@WattsWater.com and we will get back with you as soon as possible.

  • What Your Warranty Covers

    If any part of your RO PURE PLUS is defective in workmanship (excluding replaceable filters), return unit after obtaining a return authorization (see below), Within 1 Year of the Original Retail Purchase, Watts Premier will repair or, at Watts Premier’s option, replace the system at no charge.

  • How To Obtain Warranty Service

    For warranty service, call 800-752-5582 for a return authorization number. Then, ship your unit to our factory, freight and insurance prepaid, with proof of date of original purchase. Please include a note stating the problem. Watts Premier will repair it, or replace it, and ship it back to you prepaid.

  • What This Warranty Does Not Cover

    This warranty does not cover defects resulting from improper installation, (contrary to Watts Premier printed instructions), from abuse, misuse, misapplication, improper maintenance, neglect, alteration, accidents, casualties, fire, flood, freezing, environmental factors, water pressure spikes or other such acts of God.

    This warranty will be void if defects occur due to the failure to observe the following conditions:

    #1 - The Reverse Osmosis System must be hooked up to a potable municipal or well cold water supply.

    #2 - The hardness of the water should not exceed 10 grains per gallon, or 170 ppm.

    #3 - Maximum incoming iron must be less than 0.2 ppm.

    #4 - The pH of the water must not be lower than 2 or higher than 11.

    #5 - The incoming water pressure must be between 40 and 100 pounds per square inch.

    #6 - Incoming water to the RO cannot exceed 100 degrees F (40 degrees C.)

    #7 - Incoming TDS (Total Dissolved Solids) not to exceed 1800 ppm.

    #8 - Do not use with water that is micro biologically unsafe or of unknown quality without adequate disinfection before or after the system.

    This warranty does not cover any equipment that is relocated from the site of its original installation. This warranty does not cover any charges incurred due to professional installation. This warranty does not cover any equipment that is installed or used outside the United States of America and Canada.

  • Limitations and Exclusions

    Watts Premier Will Not Be Responsible For Any implied Warranties, Including Those of Merchant-ability and Fitness for a Particular Purpose. Watts Will Not Be Responsible for Any Incidental or Consequential Damages, Including Travel Expense, Telephone Charges, Loss of Revenue, Loss of Time, Inconvenience, Loss of Use of the Equipment and Damage Caused by this Equipment and its Failure to Function Properly. This Warranty Sets Forth All of Watts Premier's Responsibilities Regarding This Equipment.

  • Other Conditions

    If Watts Premier chooses to replace the equipment, Watts Premier may replace it with reconditioned equipment. Parts used in repairing or replacing the equipment will be warranted for 90 days from the date the equipment is returned to you or for the remainder of the original warranty period, whichever is longer. This warranty is not assignable or transferable.

  • Your Rights Under State Law

    Some states do not allow limitations on how long an implied warranty lasts, and some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply. This warranty gives you specific legal rights, and you may have other legal rights which vary from state to state.

    WARNING - This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: www.watts.com/prop65