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What is Commercial Water Softenening?

Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. Soft water extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes and fittings.

Water softening is traditionally achieved using ion-exchange resins where prevention of scale is the critical requirement. It can also form part of more advanced water treatment systems as an important pre-treatment to nanofiltration or reverse osmosis membranes.

For over seventy years Culligan has led the way in water treatment technology supplying our customers with safe high quality water for drinking, cooking, cleaning, bathing and manufacturing, from the smallest to the largest applications, commercial and industrial market sectors.

The Culligan products and technology used in these applications represent an ongoing commitment to delivering the very best water treatment solutions for our customers. As a result of continuous development and review, the Culligan range of commercial water softeners is one of the most comprehensive available within the market today.

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Please note: we are only able to handle enquiries from within the United Kingdom.
Commercial water softener

Why chose our “High Efficiency (HE)” range of Commercial and Industrial water softeners?

For high-efficiency water softening, nothing can match the intelligent technology of the Culligan HE high efficiency series of softeners. The patented technologies found in the Culligan HE Commercial water softener series optimise salt, water and electricity consumption by up to 46% over traditional softeners, making it the most efficient water softener in the world.

Scale in pipework
hardness scale shown in copper pipework before and after installing a water softener


  • Our HE (High Efficiency) Range of Commercial and Industrial water softeners were the first in the UK to be WRAS Approved,providing an extensive range of water softeners that comply with strict building regulations.
  • The patented technologies found in the Culligan HE Water Softener series optimise salt, water and electricity consumption by up to 46% over traditional softeners
  • Culligan’s Upflow regeneration allows up to 24% high capacity at the same salt dosage when compared to down flow systems
  • Our Proportional Brining feature monitors water consumption and regenerates only the exhausted resin
  • Culligan’s Dial-a-Softness control valve is unique to the industry, allowing consumers to set the softness required.
  • Our patented Progressive Flow feature, allows for sizing of softeners based on averrage water usage.
  • Culligan’s Smart Controller gives you more control over your equipment with programming and monitoring, a requirement when a BMS input is required for Commercial or Industrial applications
  • Both our Multi-Piston Valve design and Culligan’s exclusive corrosion resistant matrials provide reliability, durability and an extended lifespan.

Culligan High Efficiency Softener

Reduces operating costs up to 46% with patented technologies to optimize salt, water and electricity consumption

Smart Controller & High Efficiency valve

  • Multiple language full text display
  • Easy to connect to remote display, building management systems, PLC’s etc
  • Optional modem connection can alert Culligan if salt is needed or needs service
  • Upflow regeneration to increase efficiency

Brine reclaim

Optional brine reclaim system returns portion of reusable brine back to brine tank during regeneration, saving up to 25% of salt usage


Only regenerate when required – using the optional aquasensor internal probe regenerations can be initiated only when the resin is nearing exhaustion

FRP tanks

High impact FRP tanks are used up to 48” tanks or steel tanks with food grade epoxy coatings for up to 120” diameters

Resin media

High efficiency Cullex® resin is used in Culligan softener systems. The resin consists of highly porous, amber coloured, plastic beads which are covered with "exchange sites" that preferentially remove hardness ions and replace them with sodium, a "soft" ion. Once exhausted the resin is “regenerated” using a salt water brine solution and the softening process begins again.

Brine tanks

Long lasting brine tanks with corrosion proof components, including smart-brine probe to predict when you will need more salt.

Progressive Flow

Using the progressive flow feature of the Culligan Smart Controller, softeners can be installed in a chain, and will come on and offline as the flow requires, allowing peak water usages to be managed.

Providing A Smart Solution to the water softening process

HE Duplex Alternating Twin

The Cullligan HE Duplex Alternating Twin provides uninterrupted conditioned water 24/7. Two independent mineral tanks provide a continuous supply of soft water; when one tank is exhausted, the second tank takes over while the first regenerates.

The duplex alternating system benefits from upflow** proportional regeneration, which allows up to 24% higher capacity at the same salt dosage when compared to down flow systems.

culligan he water softener twin alternating duplex

HE Progressive Flow

With Culligan’s patented Progressive Flow feature, you can size softeners based on average water usage, which helps reduce costs. The feature is best suited for applications requiring intermittent/periodic high flow rates.

The Culligan® Smart Controller monitors water demand and brings the additional tank(s) online or offline as the flow demand changes. In this formation up to 6 Culligan HE softeners can be connected in series.

culligan he duplex progressive water softener

How does a “Commercial and Industrial Water Softener” work

The exchange takes place by passing hard water over man-made ion exchange resin beads, in a suitable pressure vessel tank. The resin in most modern softeners consists of millions of tiny plastic beads, all of which are negatively charged exchange sites. The ions considered in this process (calcium, magnesium and sodium) are all positivly charged ions.

When the resin is in the base state, the negatively charged resin beads hold positively charged sodium ions. As the calcium and magnesium contact the resin beads in their travel through the resin tank, they displace the sodium ions from the exchange sites.

water softener resin

Eventually all of the resin exchange sites are occupied by calcium and magnesium and no further softening exchange can take place. The resin is said to be exhausted and must be regenerated.

The resin of the softener is regenerated with a brine solution. During regeneration the flow of service water from the softener is stopped.

Brine is drawn from the brine tank, mixing water with the salt in the reservoir. The brine solution flows through the resin, contacting the resin beads loaded with calcium and magnesium ions. Even though the calcium and magnesium are more strongly charged than the sodium, the concentrated brine solution contains literally billions of the more weakly charged sodium ions.

This way, the sodium ions have the power to displace the smaller number of calcium and magnesium ions. When the calcium and magnesium ions are displaced, the positive sodium ions are then attracted to the negatively charged exchange sites on the resin.

Eventually, all exchange sites are taken up by sodium ions. The resin is said to be regenerated and ready for the next softening cycle.

Reach out to our specialists today to discuss the supply/specificcation of our HE Range Water Softeners

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