Technical Resources

What is a Ground Loop?

Ground loop can be a mysterious thing. Have you ever had a controller that was hard to calibrate, or whose readings jumped around? Welcome to the world of ground loop. It is an interfering electromagnetic energ...Read more

Water Fluoridation Additives – CDC

Community water systems in the United States use one of three additives for water fluoridation. Decisions on which additive to use are based on the cost of product, product-handling requirements, space...Read more

pH System Design Basics

Should your wastewater stream treatment style be Continuous, Batch, or Continuous-Batch? Should your control mode be Feedforward or Feedback? How you lay out your treatment schematic depends entirely ...Read more

Package Systems

Batch Make-Up Package Systems  Some concentrated chemicals need to be prepared before being ready to use. This can include dilution, blending, additional chemical feed, activation and even solution aging. It c...Read more

ORP Sensors – A Technical Education

This article is a technical education piece to thoroughly describing OPR and its characteristics, typical applications, and ORP examples. What Is “ORP”? ORP is an abbreviation for Oxidation Reduct...Read more

Making the Case For ORP

What ORP is and when and how to use it instead of free chlorine Author: Heather Rekalske Though the measurement of free chlorine concentration is often indicated for the disinfection of water and disi...Read more

Jar Testing

Jar testing is a method used to create a proportion. How much of a given chemical is needed to effect the change you want in a water sample? For example, how much of a given concentration of sodium hyp...Read more

Integrating Flow and pH Control

By itself, a pH controller is blind to variations in flow, which can easily lead to under-treating or over-treating a wastewater stream. A flowmeter on the other hand, has no idea if pH changes occur....Read more

How to Size a Chlorine Feed Pump

The calculations below will size a chlorine feed pump in gallons per day (GPD) as if the water to be chlorinated was running all the time during a 24 hour day. When your water is actually flowing, you...Read more

How to Extend pH Sensor Life

How Does A Reference Electrode Work? Courtesy of Sensorex The main conditions that affect the life of your pH sensor are the process temperature and the presence of various chemicals i...Read more

HCP Pumps Now at Furrow Pump

Since 1979, HCP Pumps of America has served residential, commercial, industrial and municipal industries with a full line of solids handling, grinder, water supply, chemical, dewateri...Read more

General pH Control

In theory, pH control is no big deal. You just balance your process chemistry or throw in some chemicals, and your problem goes away. Nice thought. In reality, pH control has occasionally been known to border o...Read more

Flowmeter Basics

A paddlewheel flow sensor is a basic sensor for determining how much water is moving through a pipe of virtually any size. How do flowmeters work? The meter’s paddlewheel must make contact with the ...Read more

Fail-Safe Pumping

We both know it isn’t really possible to make a mechanical system absolutely fail-safe, but with a little ingenuity, you can improve your odds of staying in operation. When any of LMI’s 9 Series metering pu...Read more

Chlorination Tips

TIPS ABOUT CHLORINATION  Liquid chlorine (usually sodium hypochlorite) oxidizes everything it can in water — iron, manganese, sulfur, sulfur dioxide (rotten egg smell), etc. — and kills b...Read more

Chemical Compatibility Charts

Choosing the right materials for your chemical processing equipment can be challenging. We’ve gathered together a library of downloads to help. If you have questions or need assistance choosing m...Read more

Basic Chemical Pump Questions

Answering some of these questions will help us to select a chemical pump suited to your application.   What are you pumping? Chemical name Chemical concentration Specific gravity (or density) Viscosity Tem...Read more