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Osmio MiniSoft Non-Salt Softener 1/2

The Osmio MiniSOFT is suitable for homes with 15mm pipework 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 internal corrosion, inside pipes, boilers and taps. It makes cleaning easier, the limescale residues wipe easily off surfaces (wherever the water has dried). Compact, easy to fit (no bypass needed), and simple media change every 20,000 litres. Simple, environmentally friendly and economical.
Add replacement cartridges:

Osmio MiniSoft Refill Pack

Product in stock
Manufacturer : Osmio Water


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

Polyphosphate is a food grade, non-toxic substance that is used widely in coffee machine filters and 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. It 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 makes 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 cannot be done on septic tanks. Installation must involve a bypass to the kitchen cold tap to comply with WRAS Regs.

The Osmio MiniSOFT gets even better results than a salt softener when you consider only its “internal” effect. Wherever the water cannot dry the material contact is protected from the formation of scale and corrosion (corrosion can result in expensive plumbing reapirs). The Osmio MiniSOFT does not remove the need for cleaning off the appearance of limescale nor does it affect how soap lathers. The mineral residues do not stick as much once the water has dried on a surface, making it easier to wipe off.

Model I1001176
SKU I1001176
Brand Osmio
Filter Parameter Limescale
In Depth Technical 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
Δ Pressure 0.2 bar
Water temperature 5 - 40 °C
Body Brass T58
Bowl Grilamid
Soffietto Silicon
Doser weight 850 gr
Polyphosphate weight 80 gr
Treated water 20 mc

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