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The Minimax M3 is an extremely efficient and reliable water softener with a 10-year guarantee when fitted by Hydroworks.

The MiniMax M3 fitted neatly under a kitchen sink

The UK’s Most Tried and Tested Water Softener

The MiniMax M3 marked a major leap forward in domestic water softening. When it was released, it set a new benchmark for reliability, performance, and efficiency — and helped Harvey Water Softeners become the Europe’s leading manufacturer.

While the 5th Generation environmentally friendly MiniMax Innova has since taken centre stage, the 4th-generation MiniMax M3 remains a firm favourite.

It’s still available through Hydroworks — either supply only for DIY installation, or fully supplied and installed by our expert team.

Why Choose the MiniMax M3?

• Continuous flow rate: 56 litres per minute
  
  

• Peak flow rate: 65 litres per minute
  
  

• Ultra-low water usage: Just 17.1 litres per regeneration
  
  

• Uses Harvey Original block salt — clean, compact, and convenient
  
  

• Ideal for up to 10 people with two bathrooms
  
  

• No compromises between flow rate and efficiency
  
  

• Includes a 10-year manufacturer-backed parts guarantee
  
  

• Compact dimensions: (W)206mm x (H)490mm x (D)445mm

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The 5th Generation mini-curve softener has quickly become the market leader and is our most advanced softener yet - combining eco-friendly design with smart technology.

Proof that you don’t need a big space to enjoy big benefits — compact, discreet, and beautifully designed to fit in with modern living.

The Minimax Innova takes water softeners to the next level.

The MiniMax Innova is the most advanced softener ever produced by Culligan Harvey Water Softeners — designed for modern homes and eco-conscious living.

Built on decades of trusted twin-cylinder performance, it adds 'IoT' iLid connectivity, recycled materials, and precision-engineered mini-curve salt blocks, making it the world’s first eco-friendly water softener.

It’s everything the MiniMax M3 offers — and more.

Why Choose the MiniMax Innova?

• Smart iLid Technology: Monitors salt levels, battery life, with app connectivity sending updates directly to your device and even connects with Alexa
  
  

• Eco-Friendly Design: Made from 62% recycled materials with 38% less plastic
  

  • Continuous flow rate: 56 litres per minute
    
    

  • Peak flow rate: 65 litres per minute
    
    

  • Ultra-low water usage: Just 17.1 litres per regeneration
    
    

  • Mini-Curve salt block: For better capacity & guaranteed purity
    
    

  • Ideal for up to 10 people with two bathrooms
    
    

  • No compromises between flow rate and efficiency
    
    

  • Includes a 10-year manufacturer-backed parts guarantee
    
    

  • Compact dimensions: (W)206mm x (H)495mm x (D)435mm

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Perfect for the commercial sector, or for homes with seriously high water demands - due to its bigger salt storage capacity - more infrequently accessed locations.

See inside the Minimax Big Blue: twin-cylinder precision engineering built to deliver continuous softened water, without electronics, noise, or complexity.

The MiniMax Big Blue Pro is our highest-capacity softener, ideal for homes with up to six bathrooms, or light commercial settings.

We have several dozen launderettes and hotels plus care homes, and factories using this  particular model of the BIg Blue softener, including one Royal Estate, and it's a firm favourite due to its salt and water efficiency and delivers consistently soft water without the noise, bulk, or energy waste of older commercial softeners.

This is the ultimate non-electric softener — capable of delivering up to 10,000 litres of softened water per day, while using surprisingly little salt and water.

Why Choose the MiniMax Big Blue Pro?

• Whopping flow rates: of up to 80 litres per minute
  
  

• Suitable for 4-6 bathrooms or commercial use
  
  

• Up to 10,000 litres per day depending on local water hardness
  
  

• Ultra-low water usage: Just 37-50 litres per regeneration
  
  

• Can be installed alone or linked in series for even more flow
  
  

• More salt and water efficient than many other commercial softeners
  
  

• Quiet, Reliable and Eco-Conscious
  
  

• No compromises between flow rate and efficiency
  
  

• Includes a 10-year manufacturer-backed comprehensive parts guarantee
  
  

• Cabinet dimensions: (Diam)590mm (H)660mm
  
  

A clear look at the Minimax Big Blue’s cabinet size, showing just how much power and capacity it offers in a single, self-contained unit.

• Impressive continuous flow rates of a whopping 80 litres per minute
  
  
• Depending on the water's hardness, it can produce up to 10,000 litres of water a day.
  
  
• It uses just 50 litres for regeneration.
  
  
• Suitable for up to 8 bathrooms.
  
  
• It offers both very high flow rates and super-high efficiency.
  
  
• Works on tablet salt
  
  
• The most comprehensive manufacturer-backed parts guarantee EVER.
  
  
• Dimensions: (Diam)590mm (H)660mm

Advanced Features

These are some of the features of the Minimax Big Blue:

Commercial-Level Performance

The Minimax Big Blue delivers more than most dedicated commercial systems — without their complexity or running costs. It’s a perfect upgrade from older, less efficient softeners.

Single Cabinet, High Capacity

Despite its output, the Minimax Big Blue has a sleek, self-contained cabinet with a large salt opening and easy-access design — neat, simple, and easy to maintain.

Scalable Installation

Need more than one? No problem. The Minimax Big Blue units can be linked together to suit larger hotels, care homes, or higher-demand environments — giving you flexibility as your needs grow.

Outstanding Salt Efficiency

One of the most common pieces of feedback we receive: “It uses far less salt than our old commercial softener.”

That’s the MiniMax effect.

Continuous Soft Water

With its twin-cylinder setup, the Minimax Big Blue ensures zero downtime — so there’s no hard water during regeneration.

Proven Durability

Tested to 100,000 cycles at 10 bar, like the MiniMax Major, and built to last with minimal servicing.

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The Minimax Major is designed to meet the needs of larger households and smaller businesses, delivering consistent soft water when the demands are high

The MiniMax Major’s flexible twin-cabinet design shown side by side.

In this image, you’re seeing the block salt model: the smaller cabinet holds the salt, while the larger cabinet houses the softener.

If you choose the tablet salt version, both cabinets are of the taller size.

The MiniMax Major is designed for homes with up to four bathrooms or small commercial spaces like B&Bs and clinics.

It’s compact, flexible, and capable of delivering beautifully softened water — even when multiple taps and showers are running at once.

Unlike traditional large softeners, the Major doesn’t need lots of space. Its versatile split cabinet design gives you full flexibility — install the salt tank separately, or even outdoors, if needed. And because it’s non-electric, it runs simply and silently, powered only by your water pressure.

Why Choose the MiniMax Major?

• Whopping flow rates: of up to 80 litres per minute
  
  

• Suitable for up to 20 people or 4 bathrooms
  
  

• Up to 6,400 litres per day at 300 ppm hardness
  
  

• Ultra-low water usage: Just 37-50 litres per regeneration
  
  

• Choose either the block salt or tablet salt model — block salt does make for a cleaner product, which means less maintenance
  
  

• Twin cabinet design for easy, flexible installation
  

• No compromises between flow rate and efficiency
  
  

• Includes a 10-year manufacturer-backed parts guarantee
  
  

• Cabinet dimensions: 
  

  • Softener Cabinet:
    (W)250mm x (H)500mm x (D)440mm
    
    

  • Salt Cabinet (Tablet Salt Model):
    Same as softener cabinet
    
    

  • Salt Cabinet (Block Salt Model):
    (W)250mm x (H)390mm x (D)440mm

   

You can see photos of recent installations of this softener in our Inspiration Gallery.