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Watts 315 - User Manual

Watts 315
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Watts Water Quality, 8716 W Ludlow Drive Suite #1, Peoria, AZ 85381
Phone: 800-659-8400 Fax: 800-659-8402
Manual #: 199613
Manual Date: 11/11/2015
IOM-WQ-315_415_525
Model 525P Shown
Installation, Operation
and Maintenance Manual
Under Counter Reverse Osmosis System
Model 315, 415, 525, 525P
WARNING
!
Please read carefully before proceeding with
installation. Your failure to follow any attached
instructions or operating parameters may lead to the
product’s failure.
Keep this Manual for future reference.
WARNING
!
Do not use with water that is microbiologically unsafe or of
unknown quality without adequate disinfection before or
after the system.
If you are unsure about installing your WATTS water filter, contact
a WATTS representative or consult a professional plumber.
Test the water periodically to verify that the system is performing
satisfactorily.
Discard small parts remaining after the installation.
Failure to install the system correctly voids the warranty.
Handle all components of the system with care. Do not drop,
drag or turn components upside down.
Be sure the floor under the water filter system is clean, level
and strong enough to support the unit.
IMPORTANT
CAUTION
!
NOTICE

Questions and Answers

  • M
    Matthew DiazJul 27, 2025
    Why is my Watts Water Filtration System producing water slowly?
    • S
      Sharon StoneJul 27, 2025
      Slow water production in your Watts Water Filtration System can be due to several reasons: low water pressure, crimped tubing, clogged pre-filters, or a fouled membrane. To address this, you can add a booster pump to increase water pressure, ensure the tubing is straight without any crimps, replace the pre-filters, or replace the membrane.
  • Z
    Zachary BurnettJul 31, 2025
    What to do if my Watts Water Filtration System water tastes or smells bad?
    • K
      kathleen26Jul 31, 2025
      If the water from your Watts Water Filtration System has an offensive taste or smell, it could be due to a depleted post carbon filter, a fouled membrane, or residual sanitizer that wasn't fully flushed out. You can try replacing the post carbon filter or the membrane. Also, drain the storage tank and refill it overnight.
  • A
    Ann SloanAug 5, 2025
    Why is there only a small amount of water from my Watts Water Filtration System storage tank?
    • D
      dandradeAug 5, 2025
      If your Watts Water Filtration System is producing only a small amount of water, it could be because the system is just starting up or the air pressure in the storage tank is low. It normally takes 2-3 hours to fill the tank. Low water pressure and/or temperatures can reduce production rate. Try adding pressure to the storage tank; the pressure should be 8-10 psi when the tank is empty.
  • S
    schneiderronaldAug 8, 2025
    What to do if my Watts Water Filtration Systems has leaks?
    • J
      jeffrey80Aug 8, 2025
      Leaks in your Watts Water Filtration System can occur if fittings are not tightened, if an O-ring is twisted, or if there's misalignment of the hole in the drain saddle. To fix this, tighten the fittings as necessary, replace any twisted O-rings, and realign the drain saddle.
  • M
    Michael GordonAug 13, 2025
    How to fix noise from the faucet of my Watts Water Filtration System?
    • S
      Scott GoodmanAug 13, 2025
      Noise from the faucet of your Watts Water Filtration System can be caused by the air gap faucet location, the drain saddle, or a restriction in the drain line. The noise should disappear after the system shuts down. Relocate the drain to above the water trap. Blockage is sometimes caused by debris from garbage disposal or dishwasher.
  • E
    Eric AllenAug 17, 2025
    Why is the water from my Watts Water Filtration System milky colored?
    • C
      Christopher LeeAug 17, 2025
      Milky colored water in your Watts Water Filtration System is a normal occurrence when initially starting up the RO system. This milky look will disappear during normal use within 1 to 2 weeks.
  • R
    rmartinAug 21, 2025
    What to do if there is no drain water from my Watts Water Filtration System?
    • R
      Renee LambAug 22, 2025
      If there is no drain water from your Watts Water Filtration System, it is likely due to a clogged flow restrictor. To resolve this, replace the flow restrictor.

Summary

315 RO FILTRATION PROCESS

SPECIFICATIONS

Details the stages, operating pressure, and temperature for the 315 model.

REPLACEMENT PARTS

Lists Watts item numbers, descriptions, and service life for 315 model parts.

415 RO FILTRATION PROCESS

SPECIFICATIONS

Details the stages, operating pressure, and temperature for the 415 model.

REPLACEMENT PARTS

Lists Watts item numbers, descriptions, and service life for 415 model parts.

525 RO FILTRATION PROCESS

SPECIFICATIONS

Details the stages, operating pressure, and temperature for the 525 model.

REPLACEMENT PARTS

Lists Watts item numbers, descriptions, and service life for 525 model parts.

525 P RO FILTRATION PROCESS

SPECIFICATIONS

Details the stages, operating pressure, and temperature for the 525P model.

REPLACEMENT PARTS

Lists Watts item numbers, descriptions, and service life for 525P model parts.

INSTALLATION QUICK LOOK

HOW TO MAKE A CONNECTION

Provides step-by-step instructions and diagrams for making secure tube connections.

Typical RO Faucet Installation

Non Air Gap Faucet Installation

Instructions for connecting the RO system to a non-air gap faucet.

Air Gap Faucet Installation

Instructions for connecting the RO system to an air gap faucet.

FEED WATER VALVE INSTALLATION

DRAIN SADDLE INSTALLATION

Guides on installing the drain saddle for waste water discharge.

STEP 3: MOUNTING THE TANK BALL VALVE

STEP 4: MOUNTING THE DRAIN CLAMP

Instructions for mounting the drain clamp on the drain pipe.

START UP INSTRUCTIONS

CLEANING PROCEDURES

RO Storage Tank Cleaning Procedure

Detailed steps for cleaning the RO storage tank with disinfectant.

PREVENTIVE MAINTENANCE

Filter Maintenance

Recommendations for storing and maintaining RO system filters.

Membrane Maintenance

Guidelines for maintaining the RO membrane's performance and lifespan.

Filter and Membrane Change Procedures

Step-by-step guide for replacing RO system filters and membranes.

REPLACEMENT PARTS

Model: 315

Replacement parts list for the Watts RO System Model 315.

Model: 415

Replacement parts list for the Watts RO System Model 415.

Model: 525 & 525 P

Replacement parts list for the Watts RO System Models 525 and 525P.

ARSENIC FACT SHEET

TROUBLE SHOOTING

Limited Warranty

Watts 315 Specifications

General IconGeneral
Model315
Stages1
Operating Temperature40 - 100 °F
Filtration MethodSediment Filtration
Operating Pressure25-100 psi
TypeWhole House Water Filtration System

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