clack ws1.25 metered DUPLEX water softeners

Clack WS1.25 Duplex Water Softener

Clack WS1.25” duplex water softeners are capable of a flow rates up to 7.7m3/h and makes them ideal for situations where soft water is required twenty-four hours a day, seven days a week. Small manufacturing plants, laundrettes and distilleries that have very little down time are the perfect applications, although larger domestic properties where people come and go such as hostels and hotels are also reasonable applications.

The WS1.25” duplex softener utilises a two-vessel system where hard water will never pass to service during a regeneration. It also comes with two WS1.25” Clack valves and an interconnecting motorised valve to distribute the flow of water.

Duplex Softeners need to be meter-controlled systems, otherwise there would be overlap and hard water would pass to service. In the applications where these systems are used, this is not an option. The damage to washing machines in a laundrette or restaurant over time due to passing hard water would be substantial. Duplex softeners prevent that from happening.

Our systems are built by our team of senior engineers ensuring the reliability you require and come with a typical resin life expectancy of around 10 to 15 years.

Wateq metered Clack duplex softeners consist of all the required components to allow you to start softening your water straight away.


RefDescriptionTank Size (x2)Resin Quantity (x2)Flow Rate* Capacity @ 300 ppm** Salt Usage Per Regen
DS75-C12575 Litre, WS1.25 Metered Duplex Softener13” x 54”75 Litres3.0 m3/hr12.50 m39.0 kg
DS125-C125125 Litre, WS1.25 Metered Duplex Softener14” x 65”125 Litres5.0 m3/hr20.83 m315.0 kg
DS150-C125150 Litre, WS1.25 Metered Duplex Softener16” x 65”150 Litres6.0 m3/hr25.00 m318.0 kg
DS200-C125200 Litre, WS1.25 Metered Duplex Softener18” x 65”200 Litres7.7 m3/hr33.33 m324.0 kg

* Capacity based on 50g CaCO3 hardness removed per litre of resin.
** Salt usage based on 120g per litre of resin. This will increase if salt dosage is increased.


RefInjector ColourBrine Tank Volume* Brine VolumeRegen TimeInlet / Outlet Options
DS75-C125Yellow145 Litres28.80 Litres75 Mins1.25”
DS125-C125Green145 Litres48.00 Litres95 Mins1.25”
DS150-C125Orange200 Litres57.60 Litres85 Mins1.25”
DS200-C125Light Blue350 Litres76.80 Litres97 Mins1.25”

* Brine volume based on a suggested 3.2 litres per kg of salt.


RefDescriptionWidthDepthHeightBrine Tank Diameter øBrine Tank Height
DS75-C12575 Litre, WS1.25 Metered Duplex Softener1500 mm800 mm1600 mm500 mm1060 mm
DS125-C125125 Litre, WS1.25 Metered Duplex Softener1700 mm900 mm1900 mm500 mm1060 mm
DS150-C125150 Litre, WS1.25 Metered Duplex Softener1800 mm900 mm1900 mm550 mm1160 mm
DS200-C125200 Litre, WS1.25 Metered Duplex Softener1900 mm880 mm2000 mm740 mm1275 mm


Max Flow Rate 7.7m3/hr
Includes A Built In Motorised Alternating Valve (MAV)
Drain Connections: 3/4” Male BSP
Brine Line Connection 3/8” Push Fit
Riser Tube: 32mm ø
Noryl Body
Electrical Rating: 230-12V / 50Hz
Power Rating: 0.5 Amps
Min Inlet Pressure: 20psi -1.4 bar
Max Inlet Pressure: 125psi - 8.6 bar
Average Pressure Loss Over System: 1 bar
Min/Max Temperature: 4℃ - 43℃

optional extras

SERC125WS1.25 & WS1.5 Service Kit inc. Spacer Stack, Downflow Piston & Brine Piston
V3006Bypass Valve
V3193Clack Spanner
V3009Auxilary microswitch
SALT25kg Tablet Salt
Clack Softcontrol

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Recommended 20µ pre-filter directly before the softener

Please ensure air gap on drain to prevent potential future issues

Food grade, WRAS certified strong cation exchange resin provided