Osmio MiniSoft Non-Salt Softener 1/2" BSPP Female - 30 LPM

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The Osmio MiniSOFT Suitable for homes with 15mm pipe at the entry point and up to 2 bathrooms (30 Litres per Minute peak flow rate). Smart & Environmentally Friendly Whole House Limescale Control. Protect your home from limescale and corrosion internally, inside pipes and boilers. It makes cleaning easier. Limescale residues wipe off easier off dried surfaces. Compact, easy to fit (no bypass needed), and simple media change every 20,000 litres. Simple, environmentally friendly and economical.

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Smart & Environmentally Friendly Whole House Limescale Control. Protect your home from limescale and corrosion internally,
inside pipes and boilers. It makes cleaning easier. Limescale residues wipe off easier off dried surfaces. Compact, easy to fit (no bypass needed), and simple media change every 20,000 litres. Simple, environmentally friendly, and economical.

This product uses polyphosphate which is proportionally dosed into the water at 5ppm (or 5 mg/l). It cannot over-dose the water so the level is always between 3-5ppm.

Polyphosphate is a food grade, non-toxic substance that is used widely in coffee machine filters, jug filters and has a long-established record of being safe to use and drink. Therefore, this product can be installed at the entry point of a property and serve the entire building.

This new technology is better than alternative solutions such as salt-based softeners, which are the most heavyweight, expensive, and environmentally damaging and are not an option if you have no sewerage services and your own septic tank. Salty water down the drain is an environmental disaster, especially for waste water treatment.


The Osmio MiniSOFT is suitable for properties with up to a maximum of 2 bathrooms (maximum flow 33 litres per minute) where there is 15mm pipework coming in. If you have a larger property please see the Osmio MaxiSOFT. The MiniSOFT comes with one free of charge starter refill. Each refill lasts for approximately 20,000 litres and is available to order as a pack of six refills. In a house with two adults, 6 refills last around 400 days.

Key Benefits

- Easy to fit and low cost
- Easy shut off for simple media replacement
- Avoid the formation of calcium bicarbonate preventing incrustations in pipes and heating systems
- Create a film inside the plumbing system which protects pipes from corrosion
- Environmentally friendly alternative to salt softeners that actually really works

How it works

The Osmio MiniSOFT works by proportionally dosing the water with 3-5 ppm of polyphosphate. Polyphosphates are food grade and non toxic and used in jug and coffee filters. The system can be fitted to the entry point of a property without the need for a separate bypass to the kitchen tap (i.e. it is drinkable). The media replacement is quick and easy and lasts up to 20,000 litres.

What it does compared to salt softeners

Salt based softeners actually take out the minerals and add in around 150 mg/l of sodium carbonate (not drinkable). This produces a lather effect with soap and the salt you add into it is used to backwash the resin in the tank. This flushes salty water down the drain which is an environmental problem and is not suitable for homes with septic tanks. Installation must involve a bypass to the kitchen cold tap comply with WRAS Regs.

The Osmio MiniSOFT gets even better results than a salt softener when you consider only its “internal” effect. This is where the water cannot dry and therefore the material contact is protected from the formation of scale and corrosion which is where all the expensive plumbing problems happen. The Osmio MiniSOFT does not remove the need for cleaning off the appearance of limescale nor does it affect how soap lathers. It just makes the appearance of limescale which is less prone to forming and mineral residues less do not stick as much once the water has dried on a surface, making it easier to wipe off.

The MiniSoft does not come with a spanner and the media bowl can be removed by hand, using an adjustable spanner or you can buy a MiniSoft spanner click here

The MiniSoft manual can be downloaded from the files section below.

More Information
In DepthTechnical Data

Connectors Diameter 1/2" BSPP Female

- Height 167 mm
- Length 66 mm
- Depth 95 mm

Dosing 3-5 ppm
Max Pressure 6 bar
Flow Rate 2 mc/h
Pressure drop 0.2 bar
Incoming water temperature 5 - 40 °C
Polyphosphate media is 100% effective in stored water up to 70 °C
Recommended up to 300 ppm CaCO3 (Calcium Carbonate)

Body Brass T58
Bowl Grilamid
Soffietto Silicon
Doser weight 850 gr
Polyphosphate weight 80 gr
Treated water 20 mc

Does not come with a spanner, bowl can be unscrewed by hand, using an adjustable spanner or with the MiniSoft spanner which can be purchased separately
Filter ParameterLimescale
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Product Questions

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How effective is it for the use through an electric shower?
Question by: Andrew Durrant on 17 Aug 2022, 09:09
Usually the system is installed at the point of entry so all water is treated. It can be installed to supply a single appliance, and will prevent scale build inside the appliance and cleaning of shower screen will become easier (water will leave chalky water marks when it dried.
Answer by: Irina Orlenko (Admin) on 17 Aug 2022, 09:18
Is it right that the media in the glass bowl ends up as a lump at the bottom?
I had assumed that it would slowly erode away? Please could you tell me if the device is behaving as expected?
Question by: Rory Thersby on 22 Aug 2021, 09:38
the media should slowly dissolve. Please forward pictures of installation to info@osmiowater.co.uk and we can asses if it work as it should.
Answer by: Irina Orlenko on 5 Sep 2021, 09:03
Is this safe to use with natural stone in bathrooms and kitchens .......specifically granite and marble work surfaces and tiles .
Question by: Nick Round on 15 Dec 2020, 14:29
The polyphosphate used in the system will have no damaging effect on any of those.
Answer by: Mark Kent on 10 Feb 2021, 19:00
Hi, What is the average pressure loss after this system is installed?
Question by: Atti La on 28 Sep 2021, 12:27
pressure drop for the system is minimal - it is 0.2 bar
Answer by: Irina Orlenko on 2 Oct 2021, 07:44
Will this reduce the impact of limescale on my skin and hair?
Question by: Heather E on 27 Mar 2022, 17:43
It could be because the limescale is losing the properties of bonding which block the pores of your skin, but don't forget this is a temporary hardness system (for where water does not dry) whereas a salt softener will remove the minerals permanently from the water (replacing with sodium carbonate). If you are looking to to to best for your skin and har here is what you would use: Osmio Vitafresh Vitamin C Shower Filter, Point of Entry: Osmio Pro III Ultimate 3 stage filter system (for chemicals and metals), then any type of softener (salt or non salt if your total hardness CaCO3 is less than 300ppm). Then you would use a good RO system like the Osmio Zero in the kitchen and use the Osmio Duo Hydrogen Water bottle, as it is hydrogen we produce in the gut which makes our metabolic water, hydrating and moisturising us from the inside out.
Answer by: Mark Kent (Admin) on 28 Mar 2022, 10:19