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Central Water Softener
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Central Water Softener – Efficient Softening, Say Goodbye to Scale

In a whole-house water purification system, the central water softener is typically installed downstream of pre-filters and central water purifiers. Water flows through the ion exchange resin layer inside the softener, where calcium and magnesium ions are replaced with sodium ions through on exchange technology, reducing water hardness and softening the water. The resin regenerates periodically to maintain efficient operation.

A central water softener provides softer, more comfortable water, prevents scaling that can clog pipes and damage equipment, and reduces reactions between impurities and skin oils, leaving skin smooth and clothes softer after washing.

2 central water softeners of different sizes
  • 2 central water softeners of different sizes

    SOFT-R Central Water Softener

  • 2 platinum-colored central water softeners of different sizes

    SOFT-W Central Water Softener

SOFT-R Central Water Softener
  • Description
  • Structure
  • Features
  • Specifications
  • Working Principle
Description

The SOFT-R central water softener adopts a dual-flow regeneration technology, combining both co-current and counter-current regeneration. Compared to traditional co-current regeneration, this technology maximizes the adsorption capacity of the resin, reduces water consumption, minimizes salt usage and waste, and improves resin regeneration efficiency, thus achieving energy savings and high efficiency. It is suitable for softening water in homes ranging from 70–130 m².

2 central water softeners of different heights
Structure
  1. Intelligent softening valve: It integrates filtration, cleaning, and control into one unit, enhancing softening efficiency.
  2. Resin tank: It utilizes Rohm and Haas resin from the USA, with a total resin bed height of 124 cm, offering high exchange capacity and efficient softening performance.
  3. Salt well: Equipped with a upper anti-backflow salt valve, it reduces operating noise and eliminates the risk of leakage associated with traditional salt valves.
  4. Touch control panel: It provides a clear view of the operational status and ensures easy operation.
The structure diagram of 3 central water softeners
Features
  • Integrated design, compact structure, a small footprint, easy to install, and high softening efficiency.
  • Intelligent salt refill reminder prevents low brine concentration by alerting users to add salt when needed.
  • Dual-channel distributor ensures water flow is evenly distributed across the resin tank from multiple directions, significantly enhancing flow uniformity and effectively covering the entire resin bed, reducing dead zones in water distribution.
  • Flow-time mixed /time regeneration mode enable it to automatically activate the regeneration mode either at a preset time or upon reaching a set flow volume.
  • Dry salt tank technology is adopted. The salt tank is only filled with water to dissolve salt before regeneration, keeping it dry during other stages. This prevents prolonged soaking of the resin tank and avoids brine contamination.
Specifications
Table 1: SOFT-R Central Water Softener Specifications
Model SOFT-R1 SOFT-R2
Control Valve Type Automatic softening valve
Regeneration Mode Meter-timer mix / timer
Resin Capacity 5 L 17 L
Fiberglass Tank Size 0713 0835
Recommended Flow Rate ≤ 0.5 T/H ≤ 1.8 T/H
Rated Total Soft Water Volume 3000 m3 6000 m³
Regeneration Cycle Water Production 0.65 m³ 2.28 m³
Applicable Water Temperature 4–38 °C
Applicable Water Source Municipal tap water
Working Pressure 0.15–0.45 MPa
Power Supply Standard 220V / 110V 50 Hz
Inlet and Outlet Size 3/4" or 1"
Drain Pipe Diameter Ф18 mm
Recommended House Area 70–90 m² 100–130 m²
Product Dimensions
(L × W × H)		 225 × 535 × 449 mm 225 × 535 × 1016 mm
Outer Box Dimensions
(L × W × H)		 300 × 555 × 530 mm 300 × 555 × 1125 mm
Installation Dimensions
(L × W × H)		 280 × 550 × 460 mm 280 × 550 × 1150 mm
Images of 2 central water softeners of different sizes
Working Principle
  • Softening Process: The raw water moves downward into the resin tank, where calcium and magnesium ions in the water are exchanged for sodium ions, effectively softening the water. The softened water then flows upward along the central pipe of the water tank, and finally flows out through the outlet.
  • Co-current regeneration: When the water softener reaches the set time or flow rate, it automatically draws brine into the resin tank. During this process, the water flow direction is the same as the filtration direction, moving from top to bottom. This prioritizes the removal of calcium and magnesium ions from the upper resin layer, restoring its functionality.
  • Counter-current regeneration: The control valve switches the flow direction of the regeneration solution according to the preset program. During counter-current regeneration, the water flows from the bottom to the top, opposite to the filtration direction. This thoroughly removes residual calcium and magnesium ions from the lower layer, achieving more uniform regeneration.
Internal structure and workflow diagram of the central water softener
SOFT-W Central Water Softener
  • Description
  • Structure
  • Features
  • Specifications
  • Working Principle
Description

The SOFT-W central water softener uses ion exchange resin to remove excess calcium and magnesium ions from the water, reducing water hardness and providing higher quality soft water for people. It adopts counter-current regeneration technology, injecting the regenerant from the bottom of the resin tank and flowing upward, opposite to the normal water flow direction during regeneration.

This method achieves higher regeneration efficiency, evenly restores the resin layer, reduces resin consumption, and enhances the softening effect. It is suitable for softening water in homes ranging from 80–160 m2.

2 platinum-colored central water softeners of different specifications
Structure
  1. Intelligent control valve. It Integrates filtration, cleaning, and control functions into one unit to enhance softening efficiency.
  2. Drain outlet. Outlet for discharging wastewater.
  3. Tap water inlet. Inlet for tap water entry.
  4. Soft water outlet. Outlet for softened water.
  5. Upper distributor. It evenly distributes water flow.
  6. Central tube. It transports water flow.
  7. Resin tank. It accommodates ion exchange resin.
  8. Salt well. It delivers brine solution.
  9. Upper check salt valve. It reduces noise and prevents water leakage.
  10. Resin. It softens hard water.
  11. Tank body. Made of durable plastic material.
  12. Softening salt. Used for resin regeneration.
  13. Lower distributor. It evenly distributes water flow.
The structure diagram of SOFT-W central water softeners
Features
  • Integrated design, compact structure, a small footprint, easy to install, and high softening efficiency.
  • Intelligent salt refill reminder prevents low brine concentration by alerting users to add salt when needed.
  • Dual-channel distributor ensures water flow is evenly distributed across the resin tank from multiple directions, significantly enhancing flow uniformity and effectively covering the entire resin bed, reducing dead zones in water distribution.
  • Flow-time mixed /time regeneration mode enable it to automatically activate the regeneration mode either at a preset time or upon reaching a set flow volume.
  • Dry salt tank technology is adopted. The salt tank is only filled with water to dissolve salt before regeneration, keeping it dry during other stages. This prevents prolonged soaking of the resin tank and avoids brine contamination.
Specifications
Table 2: SOFT-W Central Water Softener Specifications
Model SOFT-W1 SOFT-W2
Control Valve Type Automatic Counter-current dry brine tank softening valve
Regeneration Mode Meter-timer mix / timer
Resin Capacity 12.5 L 25 L
Fiberglass Tank Size 1017 1035
Recommended Flow Rate ≤ 1.5 T/H ≤ 3.0 T/H
Working Pressure 0.15–0.45 MPa
Power Supply Standard 220V / 110V 50 Hz
Inlet and Outlet Size 3/4" or 1"
Drain Pipe Diameter Ф 18 mm
Recommended House Area 80–120 m² 120–160 m²
Product Dimensions
(L × W × H)		 329 × 473 × 646 mm 329 × 473 × 1104 mm
Outer Box Dimensions
(L × W × H)		 330 × 500 × 710 mm 330 × 500 × 1160 mm
Installation Dimensions
(L × W × H)		 380 × 580 × 680 mm 380 × 580 × 1140 mm
Diagrams of 2 platinum-colored central water softeners of different sizes
Working Principle
  • Softening Process: The raw water moves downward into the resin tank, where calcium and magnesium ions in the water are exchanged for sodium ions, effectively softening the water. The softened water then flows upward along the central pipe of the water tank, and finally flows out through the outlet.
  • Counter-current regeneration: After operating for a period of time, the resin gradually becomes saturated with calcium and magnesium ions from hard water, losing its ability to soften the water. Therefore, regeneration is required. The control valve switches the flow direction of the regeneration solution according to the preset program. During counter-current regeneration, the water flows from the bottom to the top, opposite to the filtration direction. This thoroughly removes residual calcium and magnesium ions from the lower layer, achieving more uniform regeneration.
The regeneration working principle of a central water softener
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