User Manual
calcium and magnesium to be moderately 
hard.” 
What are some of the ideal 
applications for OneFlow
™
?
Virtually any application where scale 
reduction or scale removal from water 
hardness is required or desirable. For 
example: Hotels, Restaurants, Apartment 
Buildings, Office Buildings, Condo 
Complexes, Boilers, Irrigation Systems, 
Humidi ers, Distillers, Steam Generators, 
Solar Heating Systems, Tankless Water 
Heaters, RO Pre-Treatment, Misting 
Systems, Tract Homes Builders, 
Laundromats and numerous Food Service 
applications are all ideal applications for a 
OneFlow
™
 system. 
How about other chemicals 
found in city water, such 
as Fluoride and Chlorine, 
does OneFlow
™
 remove 
them?
No. We all know the important role that 
chlorine (or chloramine) plays in a public 
water system. It assures the delivery of 
safe potable water to every customer. 
Fluoride is commonly added to munici-
pal water systems because of the prov-
en bene ts it possesses in helping to 
develop children’s teeth and to prevent 
tooth decay. OneFlow
™
 media, by itself, 
does not remove either of these additives 
from water. However, some OneFlow
™
cartridge systems contain carbon-based 
media to remove and reduce chlorine 
in Food Service and other Point-Of-Use 
applications. Please contact your local 
authorized OneFlow
™
 Rep for the system 
most appropriate for your speci c  appli-
cation.
What factors may effect 
OneFlow’s system perfor-
mance?
Water chemistry and peak  ow rate are 
the guidelines used to assure optimal 
system performance. Most municipally 
treated (city) water falls well within our 
performance guidelines to ensure scale 
control results. However, there are chem-
istry limitations related to possible fou-
lants and interference ions. Water known 
to contain visible dirt and debris must be 
strained using a wye-pattern strainer or 
equivalent (100 mesh) before OneFlow
™
tank systems. More details are available 
on the product datasheets and IOMs. 
As with any water treatment technology, 
correct sizing of the system is important 
to ensure proper performance. However, 
OneFlow
™
 is more forgiving of  ow varia-
tions and unplanned peaks than a con-
ventional water softener.
Does the media in a 
OneFlow
™
 system need to 
be replaced?
Yes. Tank-based systems require media 
replacement every three years. Systems 
should be installed with this in mind. An 
isolation valve with a by-pass loop is rec-
ommended for most commercial applica-
tions so the tank(s) can be taken off-line 
for media replacement. Filter housing 
based systems require cartridge replace-
ment every year. Please refer to and 
follow the instructions in the Installation, 
Operation & Maintenance manual includ-
ed with the OneFlow
™
 system. 
Are there any application 
limitations to OneFlow
™
?
Untreated well water may pose a limita-
tion to OneFlow
™
 due to the unknown 
chemistry it often possesses. High hard-
ness is never a problem for OneFlow
™
, 
but with well water, hardness minerals 
are often accompanied by other contami-
nants with levels outside of our operat-
ing guidelines. Additionally, closed-loop 
systems that do not offer a “blow-down” 
or “ ush valve” are not recommended 
because the micro-crystals need to exit 
the system.
How easy is it to install a 
OneFlow
™
 system?
For anyone who has ever installed a Water 
Pressure Reducing Valve or a Back ow 
Preventer, installation of a OneFlow
™
 sys-
tem will be relatively easy. Tank systems 
offer “sweat” or “plastic MPT” connection 
sizes in 
3
/4", 1" & 1
1
/4". Larger tanks offer 
single socket or manifold connections in 
2" sizes. Several OneFlow
™
 installation 
accessories are offered to accommodate 
most applications. OneFlow
™
 systems 
are compact allowing for easy installation 
when space is limited. OneFlow's
™
 light 
weight makes it easy for the installer to 
transport with nothing more than a hand 
truck.
What are the ongoing 
maintenance costs and 
considerations for 
OneFlow
™
?
One of the great bene ts of the OneFlow
™
technology is the dramatically reduced 
maintenance requirements. Other than 
the planned media replacement, there is 
nothing else required. For tank systems, 
the media replacement is once every 
three years, and for  lter housing sys-
tems, it's once a year. That's it.
Why is OneFlow
™
 a 
“Green Technology”?
OneFlow
™
 is truly a “Green product” 
because it saves water and energy in the 
following ways:
1.  Reduces Energy Consumption –
 OneFlow
™
 uses no electricity and
  reduces energy consumption by
  keeping heat transfer surfaces free of
  energy-robbing scale formation.
2.  Reduces Chemical or Raw
  Material Consumption – OneFlow
™
  requires no chemical or signi cant
  ongoing consumable (salt, as an
 example)
3.  Reduces Waste Water Discharge and
  Water Consumption – Because 
 OneFlow
™
 does not discharge or
  require backwashing it meets 
 both objectives.
4.  Reduces Space Requirements – 
 OneFlow
™
 systems use approximately 
  75% less  oor space than water
 softeners.
5.  Retains nature's minerals in the
  water. The bene cial minerals, 
  calcium & magnesium, are 
 completely retained.
S-OneFlow-FAQ 0741    © Watts Regulator Company, 2007 
Water Safety & Flow Control Products 
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
For More Information Visit: TheScaleSolution.com
S-OneFlow-FAQ.indd 2 12/6/07 8:17:43 AM


