Regal 100 Water Softener
The smallest Regal: an ultra-compact cabinet water softener built around the reliable US-made Clack DV valve, with high flow and softening capacity from a 10 litre resin tank that fits neatly under the kitchen sink.
About the Regal 100 Water Softener
The Regal 100 is our smallest water softener. It is an ultra-compact cabinet that fits under a kitchen sink, built around the Clack DV valve with a mixing valve, and a 10 litre resin tank. It gives 1.0 to 1.2 m3 an hour of soft water and 1.8 m3 between regenerations.
It is supplied as a complete cabinet: a pre-adjusted Clack DV valve with mixing valve, the 10 litre resin tank, a pressure tank and a brine well with a safety float valve. It runs on 30 W.
At a glance
- What it is
- An ultra-compact cabinet water softener for under the sink
- Resin
- 10 litres
- Flow
- 1.0 to 1.2 m3/h
- Capacity
- 1.8 m3 between regenerations
- Regeneration
- 1.2 kg of salt, 0.08 m3 of water, 80 to 110 minutes
- Valve
- Clack DV with mixing valve
- Size
- 270 × 430 × 469 mm (W × D × H), 18.8 kg dry
- Power
- 230 V, 50/60 Hz, 30 W
What it does.
- Ultra-compact under-sink cabinet with a 10 L resin tank
- 1.0 to 1.2 m3/h operating flow with 1.8 m3 capacity between regenerations
- Clack DV valve with mixing valve and diamond-carbon coated ceramic disks
- 1.2 kg of salt and 0.08 m3 of water per regeneration (the datasheet text says up to 100 litres)
- Brine well with safety float valve
- Runs on just 30 W
Typical applications
Who the Regal 100 is for
- Homes where the space under the kitchen sink is all there is.
- Domestic installs that want high flow and softening capacity from a tank that tucks neatly under the sink.
- Installs that need a tidy cabinet with the brine well and safety float valve built in.
- Properties on mains water within the feed limits on the datasheet.
- Anyone who wants a larger model later: the Regal 150 and 200 share the same footprint.
How the Regal 100 Water Softener works
In general, a water softener swaps the calcium and magnesium that cause hard water for sodium, using a bed of ion exchange resin. When the resin is used up, the softener regenerates with salt brine and rinses the hardness away to drain.
In the Regal 100, the Clack DV valve controls the cycle. It regenerates after 1.8 m3 of softened water, using 1.2 kg of salt and 0.08 m3 of water, and the regeneration takes 80 to 110 minutes. The datasheet text says up to 100 litres, so we confirm the water use for your site at survey.
The pressure drop is 0.5 bar. The datasheet lists a hardness limit of 750 mg/L as CaCO3 on the feed water, along with limits for iron, manganese and COD, so we check your water at survey.
Which one should you choose?
The Regal range runs from under-sink cabinets to twin alternating vessels. The right one depends on how much soft water you need, and how fast.
Regal 100
You have limited space under the kitchen sink and want a cabinet softener: 10 L of resin, 1.0 to 1.2 m3/h.
Regal 150
You want a little more capacity under the sink: 15 L of resin, 1.3 to 1.5 m3/h and 3 m3 between regenerations.
Regal 200
You want the most capacity in the cabinet range: 20 L of resin, 1.6 to 1.8 m3/h and 5 m3 between regenerations.
Regal 500
You need a floor-standing softener with a separate brine tank and up to 6.12 m3/h of service flow, with the media you choose.
Regal 750
You want a ready-loaded commercial softener: 75 L of resin, 3.5 m3/h continuous and 15 m3 between regenerations.
Commercial Softener RF1465SO1
You want a 14 × 65 inch tank with a CE 1 inch valve and a large 146 L brine tank, with your choice of resin or Ecomix.
Regal Twin 3672
You need soft water that never stops: two 36 × 72 inch vessels working in turn, with 18.2 m3/h of service flow.
Installation and servicing
The Regal 100 connects to the mains with 3/4 inch connections. The connection document shows isolation valves and a bypass either side of the softener, so it can be serviced without interrupting supply. The softener's drain and overflow go to the drain riser with an air gap, using the supplied hoses, clamps and drain fitting.
A 100 micron sediment pre-filter goes upstream of the softener. The datasheet lists a 230 V, 50/60 Hz power supply at 30 W, an inlet pressure of 2 to 6 bar and a feed temperature of +4 to +30 °C. The kit includes the valve assembly, connection kit, power adaptor and drain and overflow hoses. The full detail is in the connection details (PDF).
The survey is chargeable and is credited back if you go ahead.
Regal 100 Water Softener questions answered
How much soft water does the Regal 100 give?
Up to 1.8 m3 between regenerations, at a flow of 1.0 to 1.2 m3 an hour.
How big is it?
270 × 430 × 469 mm (width × depth × height) and 18.8 kg dry. It is designed to fit under the kitchen sink.
How much salt and water does it use?
1.2 kg of salt and 0.08 m3 of water for each regeneration, as listed in the datasheet's specification table. The datasheet text says up to 100 litres, so we confirm the figure at survey.
How long does a regeneration take?
80 to 110 minutes.
What valve does it use?
A pre-adjusted Clack DV valve with a mixing valve and diamond-carbon coated ceramic-ceramic disks.
Does it have a mixing valve?
Yes. The Clack DV valve is supplied with a mixing valve. In general, a mixing valve blends a little hard water back in to set the final hardness.
What power does it need?
230 V, 50/60 Hz at 30 W.
What water can it treat?
The datasheet lists feed limits: hardness up to 750 mg/L as CaCO3, iron 0.2 mg/L, manganese 0.05 mg/L and COD 5 mg/L, at +4 to +30 °C, with a 100 micron sediment pre-filter. We check these at survey.
What pressure does it need?
An inlet pressure of 2 to 6 bar. The pressure drop across the softener is 0.5 bar.
Which size should I choose?
The Regal 100 has 10 L of resin, the Regal 150 has 15 L and the Regal 200 has 20 L. If you are between sizes, we size from your water hardness and use at survey.
Do you supply and install it?
Yes. We supply and install it. The survey is chargeable and is credited back if you go ahead.
Related products
Figures come from the manufacturer datasheet (PDF). Reviewed November 2026.
Supplied, installed and serviced across the UK
Across most of southern and eastern England, mains water is very hard. Rain filtering through chalk and limestone dissolves calcium and magnesium, and that scale coats heating elements, so we size every system to your supply and your equipment.
Tell us about your site and what you need the water for. We specify the system, fit it and keep it running under Comprehensive Maintenance.
Source: Drinking Water Inspectorate, Drinking Water Quality in England triennial report (2020–2022).
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