(800) 378-1500
285 Portsmouth Ave. Stratham, NH 03885
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The Building Blocks for Water Treatment Equipment

“Everything but the Chemicals”

Northeast Pump and Instrument (NPI) specializes in the design, sale, installation and repair of chemical feed equipment, systems and instrumentation for water and wastewater treatment. Our involvement in the industry spans more than 30 years and our technical staff boasts over 100 years of combined industry experience.


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Liquid Metronics, Inc. Products

Located in the heart of New England in Acton, Massachusetts, Liquid Metronics has been providing quality products and service to the water treatment industry world-wide for over 20 years.

Leading the way in the metering pump industry, LMI introduced the first full line of electronic metering pumps and accessories. The breadth of LMI's product line extends from low-cost metering pumps for domestic potable water treatment to highly sophisticated custom designs for specific customer applications.

Today, LMI continues to shape the future of the industry by offering the next generation of their trademark yellow and black metering pumps, the LiquiPro™ Series. This series of electronic metering pumps offers simple installation and maintenance with its unique cartridge valve design, as well as quick and easy "hands free" priming three and four function valves.

Utilizing superior designs and industry experience, as well as a state-of-the-art facility and highly trained service representatives, LMI offers Water Treatment Professionals the quality and reliability they've come to expect.

More information on LMI Products:

  • Metering Pumps LMI's family of electronic metering pumps offer:
    Adjustable stroke frequency and the flexibility of up to 1000:1 turndown ratio Manually adjustable stroke length provides accurate pump output adjustment NEMA 4X/IP65 enclosures for protection against corrosive environments Time tested electronics for reliable, repeatable performance Totally encapsulated electronics for protection against moisture and corrosive conditions Priming valves with Fluorofilm™ diaphragms and ramp style knobs for "hands free" priming.

More information on Metering Pumps:

  • Electronic Metering Pumps
    Specialized Electronic Metering Pumps
    Motor Driven Metering Pumps
    Metering Pumps Accessories
  • Controllers
    LMI's family of controllers offer: A clear, lockable front cover for easy viewing and tamper resistance Various voltage and power cord options for worldwide versatility Pre-drilled mounting flanges for easy installation Fully programmable 4 - 20 mA chart recorder output for remote monitoring and environmental compliance Set points stored in EEPROM prom eliminating the need for battery backup Totally sealed, corrosion resistant enclosure for indoor/outdoor installation

More information on Controllers:

  • Conductivity Controllers
    pH/ORP Controllers
    Digital Pump Controllers
    Flow Controllers
    Controller Accessories
  • Accessories
  • Spare Parts

If you don't see the specific information you are looking for on our website for LMI you may go to LMI's webiste at

(800) 378-1500
285 Portsmouth Ave.
Stratham, NH 03885