Chemical Metering Pumps | Macroy Series

The MACROY Series combines Milton Roy's proven industrial drive technology with a mechanically actuated PTFE diaphragm design to deliver accurate, dependable chemical dosing in a compact and cost-effective package. Available in D and G frame sizes, MACROY pumps support a wide range of water treatment, industrial, chemical, and process applications with flow rates up to 312 GPH (1,180 L/h) and pressures up to 175 PSI (12 bar).

G Series/MACROY D Metering Pumps

MacRoy D / Series G is NSF/ANSI 61 & 372 certified, ideal for low-pressure, high-output water treatment. Efficient, rugged, and smart design.

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G Series/MACROY G Metering Pumps

MacRoy G / Series G is NSF/ANSI 61 & 372 certified, ideal for low-pressure, high-output water treatment. Efficient, rugged, and smart design.

Quick Facts

Up to 312 GPH (1,180 L/h)

The MACROY G frame delivers capacities up to 312 GPH (1,180 L/h), supporting higher-volume dosing and chemical feed applications.

Up to 175 PSI (12 bar)

Designed for chemical dosing applications requiring dependable performance at pressures up to 175 PSI (12 bar).

±1% Accuracy

Provides steady-state dosing accuracy of ±1% of full capacity across a 10:1 turndown ratio.

PTFE High-Performance Diaphragm

The mechanically actuated PTFE diaphragm is designed to minimize stress and extend diaphragm life compared to conventional designs.

Flow Adjustment While Running

Precision stroke adjustment allows capacity changes while the pump is running or stopped.

Industrial Oil-Bath Drive

All gear components operate in an oil bath with low-friction bronze gears and a metallic worm gear drive for long service life.

Start With Your Application

Select your industry to explore common applications and recommended metering pump solutions

Water & Wastewater Treatment

Coagulation, Flocculation & Clarification

Accurately dose coagulants, flocculants, and treatment chemicals to improve solids removal, water clarification, and overall treatment efficiency in municipal and industrial water systems.

Disinfection & Water Quality Control

Ensure safe, high-quality water through accurate chemical dosing for disinfection, de-chlorination, fluoridation, taste and odor control, iron and manganese removal, and other critical treatment processes designed to meet water quality and regulatory requirements.

pH Control, Desalination & Water Conditioning

Optimize water chemistry, protect treatment assets, and improve overall system performance with precise dosing solutions for pH control, desalination, membrane pretreatment, hardness control, corrosion inhibition, and water conditioning applications.

Learn more about Water Treatment

Mining & Mineral Processing

Mineral Processing & Extraction

Improve process efficiency with precise chemical dosing for ore recovery, reagent addition, flotation, leaching and other critical mineral processing applications.

Battery Metals & Direct Lithium Extraction

Enable emerging energy transition projects with accurate chemical dosing for lithium recovery, battery metal processing, and direct lithium extraction applications.

Water Treatment & Tailings Management

Support water reuse, wastewater treatment, and tailings operations with reliable dosing solutions that help manage water quality and environmental requirements.

Learn more about Lithium Mining

Energy & Power Generation

Oil and Gas Production

Enable reliable upstream, midstream, and downstream operations with precise chemical injection for corrosion inhibition, hydrate prevention, scale control, and produced water treatment.

Power Generation & Utilities

Protect boilers, cooling systems and utility water processes with accurate dosing solutions that improve reliability and operational efficiency.

Refining & Petrochemical Processing

Support refining and petrochemical operations with precise dosing of catalysts, additives, and process chemicals across critical production processes.

Learn more about Energy

Chemical Industry

Circular Chemistry & Advanced Recycling

Support emerging circular economy applications with accurate dosing solutions for chemical recycling, feedstock recovery, pyrolysis processes and sustainable manufacturing technologies.

Reactor Charge, Catalyst Injection

Maintain safe and reliable operation with precise injection of catalysts, reactants, and specialty chemicals in high-pressure and process-critical chemical manufacturing applications.

Polymers & Plastics Manufacturing

Improve product quality and process consistency through precise dosing of catalysts, co-catalysts, additives and process chemicals used in polymer and plastics production.

Learn more about Solutions for Chemical Industry

What Makes MACROY Different?

Industrial Drive Technology at an Entry-Level Footprint

The MACROY Series combines Milton Roy's heavy-duty industrial drive heritage with a compact mechanically actuated diaphragm design. The result is a pump that provides greater durability and smoother dosing performance than many light-duty chemical feed pumps while maintaining an attractive lifecycle cost.

Designed for Real-World Chemicals

MACROY is available for acids, out-gassing fluids, water treatment chemicals, polymers, slurries, and other difficult process fluids commonly encountered in industrial dosing systems.

Need Help Selecting Right Pump?

Flow rate, pressure, fluid properties and application requirements all play a role in pump selection. Our team can help identify the best-fit model and configuration for your process.