Residential Softeners

Sterling offers various types of residential water softeners, which include: non-electric, mechanical time clock, mechanical meter initiated, electronic meter, and twin tank alternating systems. Sterling manufactures softeners with 3/4”, 1”, 1.25”, and 1.5” controls to handle any flow rate requirements. Below you will find a list of softeners Sterling manufacturers, along with the brochure page and manual.

IM Series

This softener brings system performance and ease of service to a new level with the modular design and adjustable regeneration cycle sequences, along with many other features.

IM Series Brochure

IM & INT Manual

IMI Series

This is a rust handler softener, which removes higher levels of ferrous iron than a standard softener. The modular design and push-button simplicity makes it easy to retrieve information.

IMI Series Brochure

HE Series

This high efficiency softener uses only 4 lbs of salt per regeneration, which will have a savings of 33% when compared to the standard softeners. This softener utilizes a revolutionary new resin that has higher kinetics resulting in less salt usage.

HE Series Brochure

HE Manual

Disinfector Series

This new softener has an automatic chlorine generator that disinfects the unit with each regeneration.  Chlorine is generated from standard salt that is used to regenerate the softener.  Hardness, iron, sulfur bacteria, and iron bacteria are all reduced by the disinfector series.

Disinfector Series Brochure

Disinfector Series Installation Sheet

EM Series

Light commercial/large residential water softener, ideal for large homes, restaurants, banks, office buildings, etc. The 1.25” valve offers high flow rates with minimal pressure loss.

EM Series Brochure

IFS Series

This is a water softener and iron filter combination unit that will do the job of three pieces of equipment (iron filter, acid neutralizer, and water softener). This unit is currently patent pending.

IFS Series Brochure

IFS Series Manual

INT Series

This softener uses fine mesh resin, which may eliminate the need for an iron filter and has a small foot print of only 11” x 24”.

INT Series Brochure

IM & INT Manual

PDSM Series

This twin tank softener provides continuous soft water 24 hours a day. Should your demand for soft water exceed the capacity of the first tank, the second tank is there to provide a continuous supply of soft water.  This series has an innovative quick connection for seamless switching between the tanks.

PDSM Series Brochure

NS Series

This softener is designed to effectively treat most common hard water problems found in either municipal or well water sources. All NS Series models are affordable and efficient to operate in removing unwanted hardness and minerals from your household water.

NS Series Brochure

NS Manual

NST Series

This series is designed to remove the tannic acid “ice tea” color from water. Hardness is also eliminated and iron greatly reduced.

NST Series Brochure

NST Manual

FS Series

This softener is designed to provide many years of dependable service. In addition to durability, they are designed to conserve salt and water. For enhanced “iron handling, “Rust Handler” models significantly outperform standard systems.

FS Series Brochure

FS Manual

Our History

Our roots go back to 1934. This was the year that Charlie Sidell started in the water treatment business with his one employee, Emmett Culligan. They manufactured manual water softeners in their Fort Wayne, Indiana facility. In 1967, the new owners Robert and Rudy Wilfong moved the factory to Churubusco, Indiana. This new location provided room to grow in a rural and more wholesome environment to build the business. And grow it did! The business evolved into the largest supplier of water treatment equipment to the plumbing and well supply trade. Today, Sterling offers a complete line of innovative filters, softeners, and reverse osmosis systems. These products are available through licensed plumbers, well drillers, and pump installers nationwide.


Sterling Water Treatment
12630 US 33 North
Churubusco, IN 46723
Ph. (260) 693-1972
Fax (260) 693-0602