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Acqua Brevetti MiniDUE ¾″ Liquid Water Softener - 30 LPM

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Quick Overview

The Acqua Brevetti MiniDUE ¾″ Liquid Water Softener is a compact volumetric proportional mechanical dosing pump water softening system which simply fits onto the rising main copper pipe or any pipe supplying a particular device, such as a boiler.The MiniDUE is a great alternative for a water softener due to it being very easy to install and to maintenance and replacing the pouches is very simple too. The system takes up very little space compared to a traditional softener as well.

Availability: In stock


Frequently bought together:


Acqua Brevetti MiniDUE ¾″ Liquid Water Softener - No Salt Water Softener

We provide a LIFETIME WARRANTY with this product - conditions apply (see details below).

Watch our introductory video

✓ Prevents limescale build up and corrosion for whole house (hot and cold) or individual appliances

✓ Brilliant eco-friendly non-salt alternative to a traditional water softener

✓ No electricity, no waste and easy maintenance

✓ Ideal for confined spaces

✓ WRAS Approved

The Acqua Brevetti MiniDUE ¾″ Liquid Water Softener is a compact volumetric proportional mechanical dosing pump water softening system designed to fit onto ¾″' (22mm copper or speedfit) pipes. The system simply fits onto the rising main pipe or any pipe supplying a particular device, such as a boiler.

The MiniDUE adds the precise dosage of AcquaSIL 2/15® Liquid to water. AcquaSIL is a 100% safe, food grade polyphosphate used specifically for the treatment of drinking water.  MiniDUE provides limescale prevention and corrosion prevention within the systems such as boilers, heaters, showers, taps, radiators, coffee machines, all plumbing fixtures and so on.

The MineDUE is a great alternative to a water softener due to it being very easy to install and to maintain as replacing the pouches is very simple and quick. The system takes up very little space compared to a traditional softener and the cost of maintenance is lower too.

The MiniDue is an eco-friendly alternative to a water softener as no water is wasted; as softeners uses thousands of litres every month to regenerate the resin - there is no need with this innovative and space saving device. It also uses no electricity and overall the system is a great innovation in the water treatment industry.

WRAS Approved Liquid Softener

How Does MiniDUE Work

MiniDUE is a self-priming mechanical volumetric pump that is operated by a turbine which in turn transmits the movement to a special cam shaft that enables the liquid to rise from the refil pouch to the injection valve, where it is injected a small amount of AcquaSIL 2/15®  Liquid into the water as it passes through the pipe. The liquid comes in pouches (sold in 250gram and 1000gram variants) that clip onto the system, which makes changing them very easy. The system comes with a remote installation kit, a 250gram refill, an installation manual and a warranty form.

MiniDUE is available as standard with ¾″ Male connections.and can be installed on a horizontal or vertical pipe by simply adjusting the orientation of the connection block. For whole house protection you can use our larger refill pouch of 1000gram which provides up to 44 cubic meters of dosage (44,000 litres) from a single pouch.

Because MiniDUE uses a liquid solution we guarantee a sludge free operation. MiniDUE is fully compliant with European Approval EU 98/83/CE for use with drinking water. and is approved by the Italian water quality approval board under DM, no. 174, 06.04.04. The Use of AcquaSIL and specifically the use of Polyphosphates is covered by the standard UNI 8065, part 5.4.1 which indicates the use of polyphosphates for the treatment of scale deposits and corrosion.


Totally mechanically operated, no power required.
Absolute and real precise proportional dosage of liquid polyphosphate AcquaSil 2/15®.
Miniaturized in minimal size dosing station suitable for household applications.
Remote installation availability. The flexible bag can be installed separately from the dosing pump, when
spaces do not allow the jointly installation.
Versatile. The pump can be oriented in all directions, just turning it; no need to reverse or disassembly its
own parts.
No need to put in by pass or drain the system during refill operations; just replace the flexible bag.
Non return valve integrated resistant to water counter pressure.
For the first time suitable also for protection of recessed boilers!, where spaces are very restricted.

About refill

Under-vacuum suction
Flexible disposable refill bags
Can be jointly or remotely to the pump be installed
Two different sizes available (250 gr. or 1000 gr, for increasing the autonomy)
Completely isolated from hydraulic circuit

The advantages of the Under-Vacuum suction and disposable refills!

Hygienic advantages. No direct handling form end user.
No periodic tank cleaning operations required.
Effective preservation of polyphosphate quality.
No evaporation of product, avoiding water concentration reduction in the liquid solution.
No atmospheric contamination.


Acqua Brevetti MiniDUE 3 quarter inch Diagram

Width (A) - 164mm

Total height (B) - 56mm

Height at connection (C) - 94mm

Distance from ground (D) - 300mm

Depth (E) - 103mm

Download MiniDue Liquid Softener Manual

Additional Information

Model PM011
Brand Acqua Brevetti
Filter Parameter Limescale
In Depth We provide a LIFETIME WARRANTY with this product - the warranty is subject to you the customer purchasing genuine liquid from Osmio Water and the installation complying with the technical specifications as detailed in the manual (i.e. flow rate, minimum/maximum incoming pressure).

Product Code: PM011 - WRAS Approved
WRAS Approval Number: 1603318 - Approved Product

Connections - ¾” M DN

Minimum flow rate - 0.24m3/h

Flow rate (P=0.2 bar) - 1.3m3/h

Flow rate (P=0.5 bar) - 1.8m3/h - 30 litres per minute

Min-max water hardness - 5 - 35°f (max 350 ppm CaCO3)

Max. instantaneous heating temperature - 80°C

Max temperature for stored hot water - 60°C

250 gr refill autonomy - 10 - 11m3

1000 gr refill autonomy - 40 - 44m3

Min-max water pressure - 1.5 - 6bar

Min-max water temperature inside MiniDUE - 5 - 30°C

Width (A) -164mm

Total height (B) - 94mm

Height at connection (C) - 56mm

Distance from ground (D) - 300mm

Depth (E) - 103mm

What is the advantage of MiniDUE?
MiniDUE is a patented device which exclusively uses a liquid 100% food grade polyphosphate designed to prevent limescale and also over time provide a de-scaling action for already encrusted surfaces.Because MiniDUE uses a liquid it 100% guarantees no sludge build up or clogging often found when using granules or powder. MiniDUE is very compact and requires no power supply. MiniDUE uses vacuum packed refill pouches which use a simple twist bayonet style fitting. Our largest refill pouch of 1000gram will provide up to 42 cubic meters of dosage, typically up to 1 years supply in a typical household.

Do I need a separate (non-treated) drinking supply?
No. this is only required when a water softener is installed which use salts. Or if other dosing systems are installed which cannot guarantee the dosage amount. MiniDUE provides 100% accurate, metered dosage of food grade polyphosphate liquid solution with is 100% safe for drinkable water

What is AcquaSIL?
AcquaSIL is our liquid polyphosphate anti limescale solution used exclusively in the MiniDUE to prevent limescale and corrosion. It is a 100% food grade liquid solution which allows a guaranteed metered dosage and delivers 100% drinkable water whilst stopping limescale build up. Polyphosphates have for years been one of the only trusted ways in which to treat and prevent limescale build up. In fact Polyphosphate is often found in many foods currently available.

What does AcquaSIL do to the water?
AcquaSIL , when released in an accurate measured dosage into the water effectively coats the mineral ions preventing them from forming on surfaces and allowing them to travel through the system. The systems has no effect of the soap effect of the water, like a salt based system does.

Will MiniDUE protect my boiler?
MiniDUE has been designed to be installed on the mains water feed directly into the boiler to provide 100% protection against limescale build up. MiniDUE also provides corrosion protection within the central heating boiler. As MiniDUE exclusively uses a liquid to provide protection, MiniDUE guarantees that no sludge or residue build up will occur thus ensuring your boiler operates at maximum efficiency. The Minidue is designed to work with water temperature of 60-65°C so is suitable for use with any domestic boiler system including Megaflow. The liquid loses its efficacy above stored water temperatures of 65°C.

Is AcquaSIL safe?
Yes. AcquaSIL and polyphosphates are classed as a ‘food grade’ additive which conform to European Standards EN1208 and World Health Organisation standards as a safe additive to drinking water.

Does it smell?
No. AcquaSIL is odourless.

Can I taste AcquaSIL?
No. AcquaSIL is a tasteless liquid.

Will it discolour my clothes?
No. AcquaSIL will not affect fabrics or finished surfaces.
  1. Better than salt review by Tel on 10/12/2018

    The fitter was great - very efficient. So far so good.

  2. A couple of months in. Hmmm review by DDStyles on 23/01/2018

    We have used salt-based softeners for some years, have an indirect cylinder and a condensing boiler. With this set-up, scale would traditionally be an issue in the immersion cylinder, washing machine and be obvious at taps and in the shower cubicle. It's better than nothing and what forms in the shower cubicle and on taps is easier to clean than full-blown calcium deposits. Without any additional water filter, the kettle produces a very ugly cup of tea and the kettle needs to be "descaled" to remove the milky-white deposits. Once the kitchen is rebuilt I suspect we will remove this product and revert to a salt based softener.

    Product quality would be 5 if the "pump" had mounting lugs.

  3. Excellent review by LV on 07/11/2017

    I can't believe I did not do this sooner - the water in our home feels so smooth and in 1 month there is zero limescale build-up around our shower heads and taps. It is so compact and easy to manage.

  4. Excellent product review by David on 04/07/2017

    Noticed a significantly difference almost immediately.
    Have recommended to several friends who have subsequently purchased with positive results.
    The plumber who installed the system was previously unaware of the product and is now proposing it to some of his customers based on my experience.
    He has I also had interest from some of his business customers.
    Given the simplicity of the system and the effectiveness, I have no problem in recommending this product based on the performance so far.

  5. Not produced the desired results review by Hard Water user on 28/08/2016

    Con: We are in a hard water area and in the 4 months of use have only seen a limited reduction in limescale build up. However still enough limescale in the water to notice a slow build up of deposits on the taps which is not we expected from this product.
    Pro: Water is softer than in the past and not had build up of brown staining from the water which is a classic hard water symptom.
    Do not want to use salt based softeners and will seek advice from the manufacturers if this does not improve within the year


    Osmio reply: Hello "Hard Water user" - the system is very effective but the flow rate miht be the issue here. Have you checked the flow rate has not exceeded the maximum 30 LPM?

  6. very good review by os on 20/07/2016

    lovely compact unit so far so good early days yet , will review in a few months.

  7. Very impressed review by Stini29 on 20/07/2016

    Has only been fitted for a month but so far very impressed. Had a space issue and couldn't fit in a standard salt softener but at this price thought it was worth a try. Takes up very little space in the cupboard. We're already noticing a huge improvement in limescale. We live in a very hard water area. My hands have suffered for years becoming very dry and cracking open easily. My hands are now almost completely smooth. I'm very happy with this!

  8. Superb review by Tony & Lisa on 08/12/2015

    So glad we went for this instead of a salt softener. Works perfectly and very easy to maintain.

  9. Works great review by Simon on 09/10/2015

    Having swapped out my water softener for the liquid softener, I was not quite expecting it to work as well but low and behold its fantastic. Its been in place for just over 1 month now and no limescale anywhere and water feels soft like it did before. The space saving we have is great and I'm very pleased to be using the small liquid pouches rather than the big heavy salt bags. What a fantastic little invention!

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Product Questions

Could you tell me which liquid softener would suit a 6 bedroom house with two bathrooms?
Is this item to soften the water to everything in the house? I ask because the install diagram show it on the feed to the boiler and a salt based softener to both this unit and the cold water feed.
The MiniDUE Operation Manual advises 6 monthly inspections to ensure proper operation and possible need for "Extraordinary Maintenance" both of which are supposed to be performed only by Acqua Brevetti authorised personnel. Is there a network of authorised personnel in the UK? Thanks.
Could you tell me which liquid softener suitable for three bathroom house?
We have had this installed today is it as simple as it seems. How often does the pouch need replacing.
It has been installed on main water entry point, is this ok for drinking water for us and pets?
Hi ,
I see all the installations are on a horizontal axis, can the unit be installed on vertical pipe work?
Many thanks,
Could you advise if there is any performance difference between this product and a salt based system. We live in Hampshire and have very hard water and are sick of the spots it leaves everywhere and the damage to the kettle etc. Will this solve the problem completely? Thanks

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