The Calmag CalSoft Mini is a compact, fully automatic metered water softener built to fit into tight household spaces — under a kitchen sink, in a utility room, or inside a kitchen cupboard. Manufactured in the UK by Calmag, founded in 2002 and the only independently owned UK manufacturer producing a complete range of domestic and commercial water treatment products, the CalSoft Mini offers a 12.5-litre resin capacity suited to households of 1–8 people.
This listing includes the 22mm stainless steel Hi-Flow installation kit, delivering up to 70 l/min maximum flow — suitable for combination boilers, unvented/pressurised systems, and Megaflow cylinders. An integrated quick-connect bypass valve with ¾" or 1" BSP adaptor fittings houses the water meter within the bypass body itself, saving approximately 5 inches of installation space compared to external meter arrangements. This model replaces the previous Calsoft M. Supplied complete with a water hardness test kit and backed by a 5-year parts guarantee.
2000L
Per Regeneration @300ppm
70 l/min
Max Flow (22mm Kit)
Please NoteThis bundle includes the full 22mm stainless steel Hi-Flow installation kit with hoses. A separate 15mm installation kit and a unit-only (no hoses) version of the CalSoft Mini are also available as separate listings — please confirm your pipework size before ordering.
Important Safety InformationA dedicated, unsoftened drinking water tap is required under UK Building Regulations when a water softener is installed. The unit requires a standard UK mains power socket to operate the electronic controller; if power is interrupted, the controller retains all pre-set programme settings in memory.
Quick-Connect Bypass with Integrated Meter
The quick-connect bypass valve uses quick-release fittings that adapt to both ¾" and 1" BSP inlet/outlet connections, with no separate meter unit required. The water meter is built directly into the bypass body, saving roughly 5 inches of installation space and simplifying the plumbing arrangement.
22mm Hi-Flow Kit Included
This listing includes the full 22mm stainless steel hose and valve installation kit — suitable for combination boilers, unvented pressurised systems, and Megaflow cylinders. The 22mm connections deliver up to 70 l/min maximum flow, avoiding pressure drop even in high-demand households.
Metered Demand Regeneration
Regenerates only when the resin is exhausted based on actual water usage — not a fixed timer. Uses approximately 2kg salt and 85 litres of water per regeneration, with a capacity of 2000 litres per regeneration at 300ppm hardness.
UK Manufactured by Calmag
Designed and manufactured in the UK by Calmag, founded in 2002 and the only independently owned UK manufacturer covering the full range of domestic and commercial water treatment products. Every unit is built and wet-tested to exacting standards before despatch.
Compact Cabinet Design
At 660mm (H) x 330mm (W) x 470mm (D), the CalSoft Mini is compact enough to fit under a standard kitchen sink cupboard in most household installations. Its stylish cabinet and hood design also makes it presentable in visible locations such as utility rooms.
Water Hardness Test Kit & Smart Electronics
Supplied with a water hardness test kit so hardness can be measured and configured correctly before installation. The smart electronic controller requires minimal programming — simply set the correct hardness level — and learns household usage patterns to optimise regeneration timing.
Performance
Resin Capacity
12.5 litres
Household Size
1–8 people
Capacity per Regeneration (@300ppm)
2000 litres
Max Flow Rate (22mm kit, included)
70 l/min
Max Flow Rate (15mm kit, sold separately)
50 l/min
Max Operating Pressure
5 bar
Min Operating Pressure
1.5 bar
Max Water Temperature
43°C
Dimensions & Weight
Dimension Note
Manufacturer-stated dimensions are approximate and exclude pipework; confirm clearance for the specific installation location, especially confined spaces.
Connections & Installation
Inlet / Outlet Connection
¾" BSP or 1" BSP (quick-connect bypass adapts both)
Installation Kit Included
22mm stainless steel Hi-Flow hoses and valves
Bypass Valve
Integrated quick-connect bypass with built-in meter
Power Supply Required
Standard UK mains socket
Salt & Consumables
Salt per Regeneration (approx.)
2 kg
Water per Regeneration (approx.)
85 litres
Salt Storage Capacity
15 kg (tablet)
Preferred Salt Type
Tablet
Warranty & Compliance
Labour Guarantee
12 months
Drinking Water Tap
Separate unsoftened tap required under UK Building Regulations
Does this listing include the installation hoses?
Yes — this listing includes the full 22mm stainless steel Hi-Flow installation kit with hoses. The 22mm kit is suitable for combination boilers, unvented pressurised cylinders, and Megaflow systems. If your pipework is 15mm only, a separate 15mm install kit listing is also available, as is a unit-only version without hoses.
What does the quick-connect bypass do?
The quick-connect bypass allows the water supply to be temporarily routed around the softener during maintenance, regeneration, or in the event of a fault, without isolating the main supply. Its quick-release fittings make connecting and disconnecting the softener significantly faster than traditional compression arrangements, and the meter built into the bypass body removes the need for a separate inline meter.
Is the CalSoft Mini suitable for a combi boiler system?
Yes — with the 22mm kit included in this listing, the CalSoft Mini is fully compatible with combi boiler systems and delivers up to 70 l/min maximum flow, avoiding pressure restriction at the boiler cold feed or hot taps. It is equally suitable for conventional vented systems, unvented cylinders, and pressurised systems.
Does the softener need electricity?
Yes — the CalSoft Mini requires a standard UK mains power supply to operate the electronic controller. A power socket should be within reach of the installation position. If power is interrupted, the controller's memory retains all pre-set programme settings.
Will the CalSoft Mini fit under my kitchen sink?
In most cases, yes. At 660mm (H) x 330mm (W) x 470mm (D), the unit is designed to fit compactly under a standard kitchen sink cupboard. Because these are manufacturer-stated approximate dimensions that exclude pipework, it's worth measuring the available space in confined installation locations before ordering.
What's the difference between this and the CalSoft Mini unit-only or 15mm kit listings?
This listing bundles the softener with the 22mm Hi-Flow installation kit, giving the highest flow rate (70 l/min) for combi boilers and pressurised systems. The separately listed 15mm kit suits standard gravity-fed systems with lower flow requirements (50 l/min), while the unit-only listing is for installers who already have compatible hoses and a bypass in place.
