Duff Co has the chemical dosing pumps you need to create the best quality water for your application—whether for a food manufacturer, a brewery, a highly sophisticated biofuel production plant, or a homeowner searching for the best drinking water for the family.

We cover the entire water cycle—from supply and treatment to distribution and discharge—and ensure exacting water quality for every step. As a full-line supplier, we have the equipment and expertise to provide you with the most efficient treatment solutions. Our Chemical Dosing Systems can be customized for any industry and we offer systems from leading companies such as Grundfos, the manufacturer of choice for these industries and more:

  • Automotive
  • District Energy
  • Biofuel Industries
  • Food and Beverage
  • Drinking Water Treatment
  • Irrigation and Agriculture
  • Marine Applications
  • Mining Industries
  • Washing and Cleaning
  • Industrial Utilities
  • Machining
  • Metal and Equipment Manufacturers
  • Pharmaceutical Industries
  • Water Distribution and Water Treatment
  • Wastewater Transport
  • Flood Control
  • Temperature Control
  • Raw Water Intake
  • Industrial Boilers
  • Family Homes

Grundfos SMART Dosing – DDA / DDC / DDE

SMART Digital Dosing Pumps are designed to safely dose even trace amounts with precision. By not overdosing and wasting chemicals, SMART pumps create a cost-effective and efficient system that protects your final product. Grundfos’ gentle yet powerful stepper motor provides continuous operation, promising a longer life by eliminating frequent, stressful starts and stops that can cause corrosion.

The SMART DDA, DDC, and DDE models offer powerful variable speed stepper motors that out-perform traditional technology.

DDA / DDC / DDE Key Features

  • The click-stop mounting plate offers unmatched installation flexibility
  • Easy to install and operate
  • Flow Control: Reliable with accuracy of 1% of setpoint when the FlowControl function is activated

DDA Models

  • Ideal high-end solution for complex, demanding applications
  • Flow and pressure up to 8 gph and up to 232 psi
  • Auto-deaeration during pump standby
  • Flexible Fieldbus controls
  • Turn-down ration 3000:1 with constant 100% stroke length

DDC Models

  • Optimal price-performance ratio
  • Flow and pressure up to 4 gph and up to 145 psi
  • Two Slow Mode functions (25% and 50%), calibration mode, and service display
  • External stop, dual-level tank control, 2 relay outputs

DDE Models

  • Digital Dosing even for low budget operation
  • Flow and pressure from 0.0015 to 4 gph and up to 145 psi
  • Two models cover the entire range
  • Control options including manual control 0.1-100% , pulse in % of stroke volume
  • External stop, empty tank control

Applications Include:

  • Food & Beverage Industries
  • Cooling Towers
  • Car Washes
  • Chemical Industries
  • Irrigation
  • Boiler Feed Water
  • Clean-in-Place (CIP)
  • Coagulation, flocculation, precipitation
  • Ultrafiltration and Reverse Osmosis (RO)
  • pH Adjustment & Disinfection
  • Drinking Water, Process Water, Wastewater
  • Anywhere chemical treatment and conditioning of water is needed!

We also stock and distribute Stenner, Pulsafeeder, Chemtech, Seko, and other brands of chemical metering pumps. Call or email our Parts Guru to find out the right pump for your application.

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Skidded Dosing Systems – DSS

Engineers and system operators rely on Duff Co. to help calculate operating and maintenance costs during the planning phase. We ensure a complete sequence of chemical processes in water technology: disinfection, flocculation, pH correction and water conditioning.

The Grundfos DSS Dosing Skid System’s pre-engineered floor or panel system offers integrated controls and up to three pump configurations to meter liquid chemicals for a variety of water supply / treatment systems, ideal for industrial and manufacturing applications.

Custom ETO Dosing Skid Systems are also available. If you require a uniquely engineered solution, a custom DSS system can be construction in nearly any configuration with any Grundfos dosing pump.

DDS Key Features

  • The DDS Grundfos Metering Pump: hydraulically-actuated and mechanically-actuated pumps that offer up to 3000:1 flow turndown.
  • SMART Digital Dosing pumps: highly-reliable, complete solutions that provide precision performance
  • Durable materials including PVC / CPVC pipe and EPDM / Viton gaskets
  • Plug and pump solutions: quick and easy installation
  • Pre-engineered systems allow for fast delivery, even for customized skids
  • ISO certified manufacturing options
  • Factory tested to the highest standards
  • Floor and wall mount options for flexible installation
  • User-friendly panel options: Junction, HOA, plug only, and none
  • Control cables options including analog, pulse, stop input, relay output, and analog output
  • Available with or without pulsation dampener

Applications Include:

  • Acids
  • Alum
  • Anti-scalants
  • Potassium permanganate
  • Sodium bisulfate
  • Sodium hydroxide
  • Sodium hypochloride

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Digital Dosing – DME

Grundfos DME Dosing Pumps combine user-friendly features with precision operation for large dosing quantities. The DME system offers all the benefits of smaller digital dosing systems, making accurate dosing on a large scale easier than ever for water supply, wastewater, and water treatment applications.

DME Key Features Include

  • Wide dosing range with turndown ratio of 800:1

    • Easy installation: Simply set the pump to discharge the exact quantity of dosing liquid

  • Available with a Profibus interface for easy-to-read performance data and system information. Allows for quality control, preventative maintenance, and future reference.
  • Dosing heads available in stainless steel, PVDF, and polypropylene
  • The simple display allows for easy menu navigation, calibration, and a wide range of standard control features such as pulse, analog, timer, batch, and anti-cavitation control.
  • Anti-cavitation: Slows suction stroke feed 75%, 50%, or 25% to facilitate the handling of viscous fluids.
  • The DME uses a full stroke length every time. Stroke speed is carefully timed to ensure even concentration and optimal priming.
  • Built-in overload protection monitors the pump’s counter pressure and protects against high pressure loads.

Applications Include:

  • Drinking water treatment
  • Pulp and paper
  • Textile industries
  • Water distribution
  • Wastewater treatment
  • Wastewater transport
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Digital Instrumentation – DID

The Grundfos by s::can DID systems combine state-of-the-art digital sensor technology and PID controlling of dosing and disinfection processes. The systems are designed to perfectly match Grundfos dosing pumps, gas dosing systems, and systems for the generation and dosing of chlorine dioxide and hypochlorite. The Fieldbus-based communication with both controller and sensors makes the systems easy to install and with pre-assembled and pre-calibrated configurations, they are extremely easy to set up.

Available as compact systems with bypass flow cell or as kits for applications with tank-immersed sensors.

DID Key Features Include

  • Probe carrier, probe guard, and 25 foot cable included for tank installation
  • Automatic setting of water flow and detection of missing water flow in systems with flow cell
  • Pre-calibrated sensors (pH, ORP, conductivity)
  • One sensor variant per parameter for all applications and measuring ranges (pH, ORP, conductivity sensors)
  • Diaphragm-covered amperometric sensor principle (free and total chlorine, ClO2, H2O2, and PAA)
  • Lowered pH dependency for free-chlorine sensors
  • Temperature compensation included for all sensors
  • Extra-long maintenance intervals (0.5 to 1 year)

Applications Include:

  • Drinking water treatment/li>
  • Swimming pool water treatment: pH control for dosing acids and alkalis, monitoring and control of residual chlorine/li>
  • Food and beverage: disinfection in filling tanks and CIP applications/li>
  • Industrial process water and wastewater treatment (effluent disinfection): pH control for dosing acids, alkalis, and control of chlorine, chlorine dioxide, or ozone/li>
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Full Line of Water Treatment Systems

Duff’s range of water treatment solutions includes packaged disinfection systems as well as measurement and control units that can be customized to meet your exact requirements. We can help you with:

  • Softeners
  • Deionizers / Demineralizers
  • Ion Exchange Systems
  • Reverse Osmosis
  • Filters
  • Side Stream Filtration
  • Ultrapure Water / Ultrafiltration
  • Ultraviolet (UV) Water

Our water treatment solutions can be specially tailored to optimize complex and demanding industrial processes – and professional support is never far away. Duff has the top experts in chemical dosing and water treatment technology in the country. Give us a call and find out for yourself.