Brackish water purifier, salinity PBW

  • Filters water with high salinity above 20 ppt.

  • Using specialized corrosion-resistant materials in saline and seawater environments.

  • The filtration capacity varies from 150 Liters/hour to 100,000 Liters/hour.

  • Filtered water is drinkable directly at the tap, meeting the standard of bottled pure drinking water (QCVN 6-1:2010/MOH)


Various capacity

Ranging from 150 Liters/hour to 100,000 Liters/hour. Especially different from other models on the market, Karofi's equipment can filter saline water from 2,000 to 20,000ppm NaCl.


Remove salts and dissolved solids from water sources through the use of high-performance reverse osmosis RO membranes, specialized for saline water.

The filtered water source can be drunk directly at the tap, ensuring that it meets the standards of purified bottled water (QCVN 6-1:2010/MOH.)

The PBW brackish water purifier  and a saline water purifier are used in the following cases:

  • Metal Finishing
  • Production of beverages and bottled water
  • Electronic device
  • Medicine
  • Mining sector
  • Mixing chemicals


  • Safe drinking water
  • Electric Factory
  • Plating operation
  • EDI . preprocessor
  • Food and drinks


  • Cooling tower
  • Laboratory
  • Boiler feed water
  • Ice production
  • Ion exchange pretreatment


Working principle

The system uses a high-pressure pump to pressurize water on the surface of the RO membrane dedicated to saline water. This RO membrane contains small holes that allow water molecules to pass through while blocking impurities (salts, minerals, bacteria, pathogens, and other organic substances, ...) The purity obtained from the center of the RO membrane has low pressure and the impurities will carry the high-pressure wastewater to the outside.

In particular, the PBW water purifier can operate at a wide pressure range (0÷30) bar, suitable for many different salinities. The saltier the water, the higher the operating pressure of the machine.

Diagram of RO technology to filter brackish water, saline water PBW

Diagram 1: Suitable for salinity range from (2,000 to 8,000) ppm



Diagram 2: Suitable for salinity range from (2,000 ÷ 20,000) ppm

Notes when using
  • Before starting the machine, check that the locking valves are completely open.
  • Do not operate the machine at too high a pressure that will damage the RO membrane.
  • Do not operate the machine continuously, run the machine for about 4-5 hours, so let the machine rest for >30 minutes.
  • If the machine is not used for >7 days, it is necessary to wash the system with fresh water.
  • The high-pressure pump head oil should be changed once a month.
  • Regularly check the coarse filter (the inner core of 2 filter cups), if it is dirty, it must be cleaned or replaced.
  • Daily record water pressure and flow parameter

1. Operation parameters:

  • Maximum temperature of feed water: 42°
  • TDS of feed water: 0 - 20,000 ppm
  • Operating pressure: 150 to 425 psi
  • pH tolerance range: 3-11
  • Feed water pressure: 40 to 80 psi
  • Maximum iron content: 0.05 ppm
  • Maximum silica content: 25 ppm
  • Filter capacity range (finished water): 150 ÷ ​​100,000 Liters/hour (can be adjusted according to the actual needs of customers).


2. Main components constituting the machine:

-     Low-pressure switch.

- High-pressure switch.

- Handheld TDS meter.

- Pipe fittings plastic, stainless steel.

- Stainless steel rack.

- 20-inch PP pre-filter 02 cores.

- Stainless steel vane high-pressure vertical pump, or corrosion-resistant copper alloy or stainless steel piston pump.

- High-grade electrical control cabinet.

- Finished water flow meter.

Option list:

- Column generates resolution.

- Online TDS meter, displayed on LCD screen.

- PLC setup, display HMI

- Inverter control pump.

- Electronic pressure gauge:

- RO protection chemical filling system

- Automatic CIP system

- Deion system DI, EDI...


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