Used for precise control over water quality, these systems must also include online measurement and control ensuring safe and reliable operation. Our extensive portfolio of solutions is designed to meet all of your gas, liquid, dry and polymer feed requirements.

Typical water treatment chemicals include:
-Gas phase chlorine, carbon dioxide, sulfur dioxide or ammonia
-Liquid phase hypochlorite, sulfates/sulfites, corrosion inhibitors, acids, caustics, antiscalants and antifoaming agents
-Polymers for coagulation, flocculation and sludge thickening
-Dry substances such as lime, activated carbon, powdered, flaked and pelletized materials

An extensive range of Wallace & Tiernan® and Stranco® gas feed, liquid feed, dry feed and polymer feed systems and analyzers and controllers provides a unique solution capability from a single source covering the entire drinking water treatment process.


Technologies in our chemical feed and control portfolio include:
Gas Feed Systems
Liquid Feed Systems
Dry Feed Systems
Polymer Feed Systems
Chemical Induction Systems
Analyzers and Process Controllers

Gas feed systems can pose serious health and safety risks.  They can also be a challenge to control accurately and reliably with varying pressures from the supply to the point of injection.

With over 95 years of experience, we pioneered the solution to these challenges.  Our gas feed systems operate using the all-vacuum principle, eliminating pressurized supply lines from the gas cylinder up to the injection point.  For the precise control of gas flow rate, our time-tested and worldwide proven V-notch flow control technology provides unparalleled performance delivering a wide range of control and high repeatability.

While liquid feed systems pose the fewest challenges, long-term accuracy and reliability are the key ingredients to success.  Of special concern are liquids that have a high vapor pressure which can be difficult to meter reliably.  This begins with selecting the appropriate materials of construction to the hydraulic, mechanical and electrical design details.

Our equipment can be used to accurately dose chemicals ranging from sodium hypochlorite, acids and caustics to viscous polymers and slurries in a dependable and safe manner. High performance materials are used in all critical areas to ensure optimum compatibility and long service life.  Our Encore® 700 diaphragm metering pump is among the most efficient and reliable pump in the industry.  And our LVN 2000 liquid chemical feed system utilizes the V-notch flow control technology, operating under vacuum, ideal for liquids that have a tendency to out-gas or become air-bound in pumps.

Dry feed systems present a different set of challenges due to their inability to flow like liquids, hide out in crevices, become compacted, clog openings, etc.  Handling of bulk materials, preparation of slurries, measuring and accurately controlling the dose can be troublesome if not done correctly.

For decades, our dry feed products and systems have been delivering outstanding performance to precisely measure and effectively disperse and dose common dry water treatment chemicals.  Special care and attention to detail go into all of our products providing long-term, low maintenance solutions.  From silos to slakers, gravimetric and volumetric feed systems, manual and automatic control, we can provide a solution to meet your needs.

Polymers, which are quite complex, posses unique properties that require special care, attention and understanding.  For full utilization of the polymer, it must be properly dissolved, activated, aged and dispersed.  If any one of these steps is not done with the utmost care, the result will be excessive polymer consumption and unreliable polymer performance, ultimately resulting in unnecessary higher operating costs.

Our innovative PolyBlend® polymer dosing technology effectively addresses and overcomes these difficulties, maximizing polymer efficiency and reducing consumption.  Available in a wide range of capacities and tailored to your exact polymer’s requirements, you can be assured of complete polymer utilization and low operating costs.

Chemical induction systems play an important role in chemical feed and control applications.  As costs for specialty treatment chemicals continue to rise, realizing the most efficient use of these includes dilution, injection and mixing. 

Our Water Champ® vacuum chemical induction system features an innovative design for superior mixing characteristics providing near perfect and instantaneous mixing.  The result - precise control, reduced chemical waste and improved chemical efficacy.