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OneFlow Series – Industrial Standard

Series Models OF744-10, OF844-12, OF948-16, OF1054-20, OF1252-30

OneFlow ®  Anti-Scale Systems

Connection Sizes: 3⁄4″, 1″ and 11⁄4″ (20, 25, 32mm)

Flow Rates: 5 gpm to 30 gpm (38 lpm to 144 lpm)

OneFlow Antiscale System

The OneFlow® Anti-Scale System provides protection from scale formation on internal and external plumbing surfaces. The OneFlow® system may be installed at the point-of-entry to a building to treat both hot* and cold water, or it can be located directly before a water heater, boiler, or other hot water-using device that requires protection from the ill effects of hard water. OneFlow® prevents scale by transforming dissolved hardness minerals into harmless, inactive microscopic crystal particles. These crystals stay suspended in the water and are passed to drain, thereby having a greatly reduced ability to react negatively like dissolved hardness does. The system requires very little maintenance, no backwashing, no salt, and no electricity. Typical hardness problems, especially build-up of scale in pipes, water heaters, boilers and on fixtures are no longer a concern. OneFlow® is not a water softener or a chemical additive (like anti-scalants or sequestrants). It is a scale prevention device with proven third party laboratory test data and years of successful residential and commercial applications. OneFlow® is the one water treatment device that effectively provides scale protection and is a great alternative to water softening (ion exchange) or scale sequestering chemicals.


  • Chemical free scale prevention and protection – converts hardness minerals to harmless, inactive microscopic crystals making OneFlow® effective alternative technology to a water softener for the prevention of scale due to water hardness
  • Virtually maintenance free – No salt bags or other chemicals to constantly add
  • No control valve, no electricity and no wastewater
  • Uses environmentally friendly “green” technology
  • Improves efficiency of all water using appliances – both hot* and cold
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  • For hot water applications where water temperature is 110°F – 150°F (43°C – 66°C), please consult ES-OneFlow-HotWater
  • Simple sizing & installation – all you need to know is pipe size and the peak flow rate
  • Perfect system for towns or communities where water softeners are banned or restricted
  • OneFlow® does not remove minerals or add sodium to the water supply
  • OneFlow® can be installed as a pre-treatment to reverse osmosis (OneFlow® should be the last stage in treatment unless a point-of-use system is being used downstream.)
ModelMaximum Flow RateConnection Sizes
OF744-1010 gpm (38 lpm)3⁄4", 1" or 11⁄4" (19, 25, 32mm)
OF844-1212 gpm (45.4 lpm)3⁄4", 1" or 11⁄4" (19, 25, 32mm)
OF948-1616 gpm (60.8 lpm)3⁄4", 1" or 11⁄4" (19, 25, 32mm)
OF1054-2020 gpm (76 lpm)3⁄4", 1" or 11⁄4" (19, 25, 32mm)
OF1252-3030 gpm (114 lpm)3⁄4", 1" or 11⁄4" (19, 25, 32mm)

Connection Options

3⁄4″ and 1″ Sweat (19 and 25mm)

1″ and 11⁄4″ Plastic MPT (25 and 32mm)

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Replacement Media

OF744RM Media should be replaced every 3 years

OF844RM Media should be replaced every 3 years

OF948RM Media should be replaced every 3 years

OF1054RM Media should be replaced every 3 years

OF1252RM Media should be replaced every 3 years



Feed Water Chemistry Requirements
pH6.5 to 8.5
Hardness (maximum)75 grains (1300 ppm CaCO3)
Water Pressure15psi to 100psi (103 kPa to 6.9 bar)
Temperature40°F to 110°F (5°C to 43°C)*
Chlorine< 3ppm
Iron (maximum)0.3 mg/l
Manganese (maximum)0.05 mg/l
CopperNone allowed
Oil & H2SNone allowed
PolyphosphateNone allowed
Silica (maximum)10 ppm

Note: Water known to have heavy loads of dirt and debris may require pre-filtration prior to OneFlow.


Independent scientific testing has confirmed Template Assisted Crystallization (TAC) technology provides scale reduction of over 95+%. Testing was conducted under protocol based on DVGW W512 test to access control of scale formation.


of-dims2A OneFlow® scale prevention system shall be installed on the main water service pipe just after it enters the building, but after other whole building water safety devices (back flow preventers or pressure reducing valves), to effectively address water hardness concerns. A system may also be installed further downstream to protect specific equipment or areas within a plumbing system. The system shall be plumbed with a bypass valve to allow isolation of tank(s) and to allow the bypass of untreated water usage in the event that service or media replacement be necessary.

The installation area should be suitable in size for the tank(s) to be serviced without encumbrance and sit upright on a flat level surface. The system must not require additional wastewater to backwash, flush, or regenerate once put into service. The system shall not require any chemical additives and shall not require electricity for operation.

Note: Copper lines need to be passivized for a minimum of 4 weeks before placing unit into service. Not for use on closed loop systems.



The overall height and the height of the fitting varies due to material variations and assembly tolerances.

Please allow additional clearances above the tank for making connections.

Peak Flow Rates - Weights
*Maximum Flow10 gpm37.8 lpm12 gpm45.4 lpm16 gpm60.6 lpm20 gpm75.7 lpm30 gpm113.6 lpm
Dry Weight22 lbs10.0 kgs25 lbs11.3 kgs29 lbs13.2 kgs35 lbs15.9 kgs43 lbs19.5 kgs
Service Weight80 lbs36.3 kgs97 lbs44.0 kgs129 lbs58.5 kgs168 lbs76.2 kgs235 lbs106.6 kgs

*Exceeding maximum flow can reduce effectiveness and void warranty.