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Installation, Operation and 
Maintenance Manual

Residential OneFlow

®

 Anti-Scale System

Chemical-Free, Salt-Free Scale Prevention
Model OFRES-0835
Model OFRES-0935
Model OFRES-1035

Introduction

The Watts residential OneFlow

®

 system provides protec-

tion from hardness related scale formation throughout the 

plumbing system. The OneFlow

®

 system can be installed at 

the point of entry to treat your entire home. These systems 

are designed to treat the domestic water used in a single 

family dwelling. For higher volume applications please con-

tact your Watts representative.
OneFlow

®

 reduces or eliminates scale formation on internal 

plumbing surfaces.
OneFlow

®

 prevents scale by transforming the normal dis-

solved hardness minerals into undissolved crystal micro-

particles. These crystals stay suspended in the water and 

have a reduced ability to react and attach to surfaces like 

dissolved hardness minerals do. Therefore, the problem of 

internal buildup of scale in pipes, water heaters and plumb-

ing fixtures is greatly reduced.
Unlike softened water, OneFlow

®

 treated water maintains the 

beneficial essential mineral content of your water.

•  Use only lead-free solder and flux for sweat-solder connections, 

as required by state, province and federal codes.

•  Handle all components of the system with care. Do not drop, 

drag or turn components upside down.

•  Be sure the floor under the system is clean, level and strong 

enough to support the unit.

• Install the system in a protected area.
•  Do not attempt to treat water over 100°F (38°C) with the system.
•  Always connect the system to the main water supply pipe before 

the water heater.

•  Do not expose the system to freezing temperatures. Water freez-

ing in the system causes equipment damage.

•  Do not install in direct sunlight. Ultraviolet rays from the sun may 

cause damage.

IOM-OFRES

OFRES

 

 

If you are unsure about installing your Watts OneFlow

®

 system 

contact a Watts representative or consult a professional plumber.
You are required to thoroughly read all installation instructions and 

product safety information before beginning the installation of this 

product. 

FAILURE TO COMPLY WITH PROPER INSTALLA-

TION AND MAINTENANCE INSTRUCITONS COULD RESULT 

IN PRODUCT FAILURE WHICH CAN CAUSE PROPERTY 

DAMAGE, PERSONAL INJURY AND/OR DEATH.

 Watts is not 

responsible for damages resulting from improper installation and/or 

maintenance. Local building or plumbing codes may require modi-

fications to the information provided. You are required to consult 

the local building and plumbing codes prior to installation. If this 

information is not consistent with local building or plumbing codes, 

the local codes should be followed.
Save manual for future reference.
Refer to the enclosed for operating parameters to ensure proper 

use with your water supply.

Table of Contents 

Pages

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Instructions Before Using. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
OneFlow

®

 Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Equipment Specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Using OneFlow

®

 with Other Equipment  . . . . . . . . . . . . . . . . . . . . 3

Important Note- Iron, Manganese, Copper  . . . . . . . . . . . . . . . . . 4
Cautions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Notes to the Installer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation and Start Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bypass Valve Modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Note to the Home Owner  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

WARNING

!

WARNING

!

Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information 

can result in death, serious personal injury, property 

damage, or damage to the equipment.
Keep this Manual for future reference.

Summary of Contents for OneFlow OFRES-0835

Page 1: ...ply pipe before the water heater Do not expose the system to freezing temperatures Water freez ing in the system causes equipment damage Do not install in direct sunlight Ultraviolet rays from the sun may cause damage IOM OFRES OFRES If you are unsure about installing your Watts OneFlow system contact a Watts representative or consult a professional plumber You are required to thoroughly read all ...

Page 2: ...n hookup Compatible with all on site and community wastewater treatment systems Not subject to water softener restrictions and bans Tank Head Media Tank System Overview CK V3006 Bypass Assy EDP 0002167 Bypass Valve and Connection Fittings Setup Unpack and check the system components for damage or miss ing parts Installation Considerations Consider the following points when determining where to ins...

Page 3: ...pecifications Model 835 935 1035 Max Service Flow gpm 8 12 16 Dry Weight lbs 19 23 25 a 40 40 40 b 37 37 37 c 12 12 5 13 Using OneFlow with other water treatment chemicals The addition of soaps chemicals or cleaners before or after OneFlow treatment may reverse its anti scale treatment effects and or create water with a heavy residue or spotting potential Any adverse conditions caused by the addit...

Page 4: ...Because the OneFlow system operates in the UP flow mode the tank connections are opposite of traditional instal lations Please follow water flow diagram illustrated in Figure 3 Please see the Important note about iron manganese and copper in the water supply section Please see the note about Using OneFlow with other water treatment equipment on the previous page This system is designed for residen...

Page 5: ...ply valve when a steady stream of water comes out of the outlet port If the outlet is flowing into a bucket water could splash on nearby objects If this threatens the safety value structure or appearance of these objects protect remove them or use the outlet hose to drain option 9 Close the inside faucet 10 Connect the outlet of the OneFlow system to the cold water supply to the house 11 Open the ...

Page 6: ...er volume and specific water chemistry If you notice a change in performance after a three year period and feel the media should be replaced contact your system installer professional plumber or water treatment expert to perform a re bed service The color of the media should be noted any time it is replaced to ensure the media has not be come fouled If it has additional pretreatment for the system...

Page 7: ...7 ...

Page 8: ...rom date of original installation Such replacement media will be delivered to the owner F O B nearest factory at no cost excluding freight and local labor charges if any Damage to the media due to chlorine other oxidizers or fouling caused by local water conditions or any other operation outside of the limits shown under Specifications is not covered by this warranty THE WARRANTY SET FORTH HEREIN ...

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