Ion-Exchange Resin
High-capacity resin designed for domestic drinking-water softening.
CRYSTAL 35L Clack WS1 UF combines 35 litres of ion-exchange resin, demand-based automatic control and salt-efficient Upflow regeneration. It helps reduce limescale throughout the home without requiring a large separate salt tank.
High-capacity resin designed for domestic drinking-water softening.
Published flow rate for the CRYSTAL 35L model. Actual sizing depends on peak household demand.
Counter-current brine regeneration designed to make efficient use of salt.
Hardness comes mainly from dissolved calcium and magnesium. The softener captures these ions on resin and exchanges them for sodium ions, reducing water's tendency to form scale.
Incoming water flows through the ion-exchange resin bed.
Resin retains calcium and magnesium ions, releasing sodium ions.
Water with reduced hardness is delivered to household outlets and appliances.
During normal service, resin gradually becomes saturated with calcium and magnesium. Regeneration restores its softening capacity. In the CRYSTAL system, the brine solution travels upward through the resin bed, a process known as Upflow or counter-current regeneration.
Counter-current regeneration can make better use of brine than conventional co-current approaches when correctly configured. The CRYSTAL technical sheet specifically identifies optimized, low-salt regeneration.
The volumetric Clack WS1CI controller uses programmed settings and water consumption to manage regeneration, rather than relying on a fixed time interval alone.
Proper regeneration helps restore the ion-exchange resin for continued hardness reduction between cycles.
Salt-efficient regeneration helps manage ongoing costs. Exact salt and water savings depend on water hardness, operating settings and the comparison system.
In Downflow regeneration, brine travels from the top of the resin bed downward. With Upflow, brine enters from below and moves upward, reversing the service-flow direction in a typical counter-current design. This can improve regeneration efficiency, but a specific percentage saving is not stated in the CRYSTAL datasheet.
Reducing calcium and magnesium hardness helps limit limescale deposits where household water is heated, sprayed or left to dry.
Fewer hard-water marks on glass, mixers and bathroom fittings.
Less scale accumulation on heating surfaces and associated pipework.
Helps protect washing machines and dishwashers against hardness-related deposits.
Soaps and detergents generally work more readily in softened water.
A cabinet design integrates the resin vessel and salt storage, while the digital control valve manages regeneration. Owners mainly need to monitor and replenish suitable regeneration salt.
The manufacturer's sheet does not specify salt storage capacity, regeneration water volume, service interval or a fixed percentage saving. These are deliberately not claimed here.
Product characteristics stated in the CRYSTAL technical sheet.
| Model | CRYSTAL 35L Clack WS1 UF |
|---|---|
| Product type | Compact cabinet water softener |
| Treatment method | Ion exchange |
| Resin volume | 35 L |
| Resin application | High-capacity resin for domestic drinking water |
| Control valve | Clack WS1CI, volumetric, digital programmer |
| Regeneration | Optimized Upflow |
| Flow | 1.9 m³/h |
| Salt per regeneration | 3.5 kg |
| Dimensions (W × D × H) | 320 × 500 × 1140 mm |
| Connection | 1″ |
| Operating pressure | 2.5–6 bar |
| Maximum water temperature | 40°C |
| Power supply | 230 V / 50 Hz |
| Bypass | Included |
The correct water softener size and settings depend on inlet hardness, desired outlet hardness, peak simultaneous demand and available pressure.
Mains Water → Suitable Sediment Pre-Filter → CRYSTAL 35L → Household Water Distribution
The pre-filter is a general installation recommendation, not a component specifically listed in the CRYSTAL datasheet. Confirm suitable filter specifications with the installer.
Verify pressure, hardness, physical clearance, power availability and suitable drainage for regeneration discharge.
Do not assume the cabinet is weatherproof. Confirm protection from direct sun, rain and high ambient temperatures before selecting an outdoor installation location.
A water softener reduces hardness; it is not a substitute for disinfection or a complete drinking-water purification system.
Practical answers about CRYSTAL 35L, Upflow technology and household installation.
It is a compact, automatic, ion-exchange water softener with 35 litres of resin, a volumetric Clack WS1CI valve and optimized Upflow regeneration.
Upflow describes the direction of brine during resin regeneration. The brine moves from the bottom of the resin bed upward, helping achieve efficient regeneration when the system is properly configured.
The CRYSTAL technical sheet states that its Upflow system is optimized for low salt consumption. It does not provide a verified percentage saving compared with another system.
The published figure for the 35-litre model is 3.5 kg per regeneration cycle. Actual regeneration frequency depends on hardness, consumption and controller settings.
Yes. Its Clack WS1CI valve provides volumetric control with a digital programmer. Regeneration follows the configured operating logic and measured water consumption.
Possibly, but resin volume alone does not determine suitability. FILTER.CY should assess inlet hardness, peak flow and daily water usage to confirm whether this model is appropriately sized.
No. Ion-exchange softening targets hardness ions, primarily calcium and magnesium. It is not a disinfection system and does not replace filtration or other treatment needed for specific contaminants.
Only where a qualified installer confirms suitable environmental protection, plumbing, electrical supply and drainage. The supplied datasheet does not state an outdoor weatherproof rating or maximum ambient temperature.
Here, “UF” identifies the Upflow regeneration configuration. It does not mean ultrafiltration.
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