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pH Adjustment – Recirculated

MAK’s pH Adjustment – Recirculated (PAR) plants are designed to automatically adjust and maintain the pH level of raw water in a storage tank, prior to discharge to sewer/environment or reuse/recycling. The standard treatment process includes a recirculation pump to turn over the contents of the storage tank twice in a 24 hour period, an inline pH analyser which monitors the pH level and a dosing pump to automatically dose liquid alkali/acid. Dual chemical dosing pumps (alkali/ acid) are available for when the raw water pH varies to allow for correction of both low and high pH raw water.

The system components are sized to suit the storage tank and daily usage. Optional equipment upgrades include; duty standby recirculation and dosing pumps, high/low pH levels, dual chemical dosing pumps (alkali/acid). MAK PAR plants are available as skid mounted or containerised systems for easy deployment to remote locations.


Parameter Units PAR-10 PAR-25 PAR-50 PAR-100 PAR-250 PAR-500 PAR-1000 PAR-2500
Storage Tank Size (by others) m³ 10 25 25 100 250 500 1,000 2,500
Recirculation Pump Flow Rate m³/hr 0.8 2 2 8.3 20.8 41.6 83.3 208.3
Recirculation Pressure kPa 100 ~ 200
pH Level (target) pH 6 ~ 8 (pH neutral) or as required
pH Range (standard) pH 4 ~ 12
Raw Water Temperature °C 15 ~ 35
Ambient Design Temperature °C 5 ~ 35 (-15 ~ 50 for insulated containerised system)
Feed Water Inlet Pressure kPa >15 (flooded suction)
Power Supply  - AC 240V, 1 phase, 50Hz or AC 415V, 3 phase, 50Hz AC 415V, 3 phase, 50Hz
Installed Power (approx.) kW 1 1 1 1.5 2.5 3.5 6 16
Bunded Chemical Storage Tank  L 200 200 200 500 500 1,000 1,000 1,500
Container Size (optional) ft 10’ 10’ 10’ 10’ 10’ 10’ 10’ 20’
Skid Size mm 1,300 x 560 x 1,500 2,000 x 1,500 x 1,500


✓= Standard Supply o = Optional Supply - = Not Applicable

Equipment PAR-10 PAR-25 PAR-100 PAR-250 PAR-500 PAR-1000 PAR-2500 PAR-5000
Skid Mounted Plant
Recirculation Pump
Chemical Dosing Pump
Bunded Chemical Storage Tank
PLC Control System with HMI
Alarm Signal Output for Client Interface
Containerised System, c/w A/C & Lights o o o o o o o o
Container Non-slip Floor Coating o o
Container Insulation (walls & ceiling) o o o o o o o o
Container Side Access Door - - - - - - o o
Duty Standby Recirculation Pumps o o o o o o o o
Duty Standby Dosing Pumps o o o o o o o o
pH 1-12 Recirculation Pump o o o o o o o o
Dual Dosing Pumps (alkali/acid) c/w Dual Bunded Chemical Storage Tanks o o o o o o o o
Safety Shower & Eyewash Station o o o o o o o o


Instrumentation Standard Package Premium Package
Pressure Gauge
Flow Switch
Float Switch (chemical storage tank)
pH Analyser (4-20 mA)
Level Transmitter (4-20 mA, chemical storage tank) -
Data Logger (pH level) -
Remote Monitoring & Control Capabilities -


Disclaimer: MAK Water is continuously updating and improving its products and services, so please contact us for more detailed information or to confirm specifications. MAK Water takes no responsibility for any errors resulting from the use of information contained within this document.