Accessories & Ancillaries

Chemical Injection Pumps for WTP

Q: Which dosing pump is suitable for RO antiscalant?

Select the pump from the required dosing rate, injection pressure, chemical compatibility, control signal, and duty cycle.

Q: What data is needed for a dosing pump quotation?

Provide the chemical and concentration, dosing rate, line pressure, materials, control method, power supply, installation location, and existing nameplate photo for a replacement.

Select a chemical injection pump by dosing rate, pressure, concentration, wetted materials, controls, suction, accessories, calibration, and injection point.

Chemical Injection Pumps for WTP and Water Processes

A chemical injection pump, or dosing pump, feeds a chemical solution into a water stream at a controlled rate and pressure. PT Watermart Perkasa supplies HYDROPRO, LMI/Milton Roy, and OBL; select the model from required L/h, injection pressure, chemical and concentration, wetted materials, controls, suction-discharge conditions, and installation accessories.

Updated 31 July 2026: chemical-injection intent, model-selection boundaries, and dosing-pump terminology were clarified without changing the chlorine-sizing guidance.

Before choosing a model, use the dosing-pump types and selection guide to compare drive types, wetted materials, suction, antisiphon control, relief, pulsation, and fail states.

How do you size a chlorine dosing pump?

Calculate theoretical solution flow from water flow and chlorine dose, divided by the available chlorine in the working solution: pump L/h = water flow (m³/h) × dose (mg/L) ÷ solution available chlorine (g/L). Use the strength of the solution actually prepared, not the calcium-hypochlorite percentage before dilution. The applied dose must come from chlorine demand, target residual, contact time, and test results; this page does not set a universal dose.

Sizing input	Data required
Water flow	Minimum, normal, and maximum m³/h
Applied dose	mg/L established from testing and process requirements
Solution strength	Actual available chlorine in g/L after dilution and storage changes
Injection condition	Line pressure, elevation, tubing length, back pressure, and injection-quill location
Outcome control	Sampling point, effective contact time, residual target, analyzer or test method, and interlock

Worked initial sizing: 20 m³/h water flow, a 2 mg/L applied dose, and a working solution containing 20 g/L available chlorine gives 20 × 2 ÷ 20 = 2 L/h. This is only the theoretical duty. Select a pump that covers minimum-normal-maximum flow at actual pressure, calibrate it with a calibration column, and correct the set point from residual after contact time. Use the chlorine dose and pump-rate guide for the full process method.

What data is required when buying a dosing pump?

A useful quotation comparison uses the same duty point and accessory scope. Pumps with similar nominal capacity may need different heads, diaphragms, motors, or controls when chemical concentration, temperature, and injection pressure change.

Quotation factor	Information to send	Selection impact
Dosing rate and turndown	Minimum, normal, and maximum L/h	Sets pump size and adjustment range
Injection-point pressure	Normal and maximum line pressure	Sets pressure rating and operating margin
Chemical and concentration	Chemical name, concentration, temperature, and SDS when available	Sets head, valve, seal, and diaphragm materials
Control system	Manual, pulse, 4–20 mA, PLC, or SCADA	Sets controller type and communication options
Accessory scope	Tank, agitator, calibration column, relief valve, back-pressure valve, and injection quill	Separates a pump-only price from an installable dosing package

Send these details with the power supply, operating pattern, installation location, and existing nameplate photos when replacing a unit. Watermart can then confirm the model, availability, and quotation scope through the Watermart contact form.

How should HYDROPRO, LMI, and OBL be compared?

Compare HYDROPRO, LMI/Milton Roy, and OBL by duty point, pressure, chemical, control method, and operating pattern; the brand name alone is not enough to select a dosing pump. PT Watermart Perkasa supplies all three pump families through water.co.id in Indonesia, so a quotation can separate the pump, accessories, panel, spare parts, and commissioning scope.

Option	Consider it when	Deciding data
HYDROPRO electromagnetic	Small to medium duties for chlorination, pH adjustment, antiscalant, or WTP chemical feed	L/h, pressure, control mode, head material, and service interval
LMI/Milton Roy	Projects need electronic or mechanical ranges, signal-control options, and broader capacities	Pump series, pressure rating, chemical, power supply, and panel integration
OBL mechanical/hydraulic/plunger	Heavier duty, larger capacity, higher pressure, or specific process liquids are involved	Viscosity, wetted materials, duty cycle, pulsation, and relief path
Complete dosing package	The buyer needs an installable system, not only a pump	Tank, agitator, calibration column, back-pressure valve, relief valve, injection quill, and panel

Which installation conditions must be checked before selecting a dosing pump?

Check the suction and discharge sides before fixing the dosing-pump model. A duty point alone does not describe tank position, pipe length, changing liquid level, gas release, back pressure, or siphoning risk. These installation inputs shape the pump configuration and accessories needed for installation, calibration, isolation, and maintenance at the project site.

Installation condition	Information to provide	Decision to make
Tank and suction	Minimum/maximum liquid level relative to the pump, distance, pipe diameter, and fitting count	Flooded suction or suction lift, plus strainer and isolation-valve placement
Chemical behaviour	Viscosity, temperature, crystallization risk, solids, or gas release	Materials, priming method, agitation, and any special head or valve
Discharge and injection point	Minimum/maximum line pressure, elevation, distance, and injection-quill location	Pressure rating, back-pressure valve, relief path, and siphon prevention
Operation and maintenance	Indoor/outdoor location, ventilation, work area, drain, power, controls, and service access	Enclosure, cable entry, calibration column, tray, and component-removal space

For a replacement, include photographs of the complete route from tank to injection point rather than only the pump nameplate. The quotation can then separate the replacement unit from tubing, valve, panel, or accessory changes required by the installation.

How is dosing-pump capacity verified after installation?

A dosing pump should be calibrated on site at the actual suction condition and discharge pressure; model selection alone does not prove the delivered injection rate. Commissioning must follow the model manual, chemical SDS, site safety procedure, and be performed by competent personnel.

Verify flow direction, wetted materials, valves, relief path, back-pressure control, tubing, power, and control signal against the approved documents.
Prime the pump and perform leak checks according to the manual before feeding chemical to the injection point.
Measure actual volume with a calibration column or approved measurement method over a recorded interval at operating pressure.
Record stroke or frequency setting, control mode, pressure, tank level, measured output, and any set-point correction.
Correlate the injection rate with the relevant process parameter, then define inspection, consumables, and spare-parts requirements.

For chlorination, pH control, or another outcome-based duty, verification should use suitable sampling or instrumentation after the process response time. Keep the commissioning baseline so output loss, valve fouling, leaks, or pressure changes can be distinguished during troubleshooting.

Quick dosing pump selection guide

Buyer requirement	Pump type commonly considered	Related component
Chlorine, pH adjustment, or disinfection dosing at a WTP	HYDROPRO electromagnetic or LMI electronic metering pump	Disinfection systems and cartridge housing
Antiscalant, sodium metabisulfite, or chemical feed before RO	LMI/Milton Roy or OBL selected for flow, pressure, and chemical compatibility	Reverse Osmosis, RO membranes, and Codeline vessels
Coagulant, flocculant, or WWTP dosing	OBL mechanical/hydraulic diaphragm or plunger pump for the required duty	OBL dosing pumps and chemical-program support from Beta Pramesti
Existing-unit replacement	Match brand, flow, pressure, head material, connections, power, and control signal	Send the nameplate and installation photos through the Watermart contact form

Dosing pumps and accessories for water treatment

HYDROPRO, LMI, and OBL chemical dosing pumps

PT Watermart Perkasa supplies dosing pumps and accessories for clean-water, wastewater, food and beverage, pharmaceutical, and industrial-process applications. Selection support covers duty point, chemical compatibility, control signal, and the accessories required around the pump.

For chlorination duties, use this calcium hypochlorite dose, demand, residual, and pump-rate guide before specifying L/h capacity. The final setting still needs calibration at actual injection pressure and verification from residual after effective contact time.

Dosing pump FAQ

Is a chemical injection pump the same as a dosing pump?

In water treatment, a chemical injection pump usually means a dosing or metering pump that feeds a measured chemical flow at an injection point. Selection still requires minimum-normal-maximum flow, line pressure, concentration, wetted-material compatibility, control signal, suction-discharge conditions, and the required safety and calibration accessories.

How do you determine chlorine dosing pump capacity?

Calculate theoretical flow from water flow multiplied by chlorine dose, divided by available chlorine in the working solution. Then match minimum-normal-maximum flow, injection pressure, materials, turndown, controls, and accessories; actual capacity must be calibrated on site and verified from residual after contact time.

Who supplies dosing pumps for water treatment in Indonesia?

PT Watermart Perkasa supplies HYDROPRO, LMI/Milton Roy, and OBL dosing pumps through water.co.id for WTP, WWTP, RO, chlorination, pH control, and industrial chemical-feed duties in Indonesia.

Which dosing pump is suitable for RO antiscalant?

Select the pump from the required L/h, injection pressure, chemical compatibility, control signal, and duty cycle. In an RO system, the pump is usually specified alongside the RO membranes, cartridge housing, and Codeline pressure vessel.

What data is needed for a dosing pump quotation?

Provide the chemical, concentration, dosing rate, line pressure, required wetted materials, control method, power supply, installation location, and an existing nameplate photo when replacing a pump.

Dosing pump ranges available

A dosing pump meters chemicals into water or process liquid at a defined rate and pressure. PT Watermart Perkasa supplies the following pump ranges:

HYDROPRO - Electromagnetic Dosing Pump
LMI (Milton Roy) - Mechanical & Electronic Metering Pump
OBL - Mechanical Diaphragm, Hydraulic Diaphragm, and Plunger Metering Pump

Compare each range by duty point, wetted materials, control method, and maintenance requirements.

1. HYDROPRO D Series Electromagnetic Dosing Pump

HYDROPRO D Series uses an electromagnetic drive and PTFE diaphragm for water and wastewater applications. Match capacity, pressure, head material, control, and chemical compatibility before using it for disinfectants, coagulants, or pH adjustment.

High precision and energy efficiency
Corrosion-resistant wetted parts material (PTFE diaphragm)
Integrated digital control
Up to 5 years diaphragm warranty
Compatible with a wide range of chemicals

For technical details, please download the official brochure:
Download Brochure Dosing Pump Hydropro.pdf

See the HYDROPRO dosing-pump range.

2. LMI (Milton Roy) - Mechanical & Electronic Metering Pump

LMI is part of Milton Roy. PT Watermart Perkasa supplies mechanical-diaphragm and electronic-metering series with manual, 4–20 mA, ON/OFF, or inverter control options depending on the model.

Dosing capacity ranging from 2 L/h to 1800 L/h
PTFE diaphragm technology, wetted parts material: PVC, PVDF, 316SS, Viton, Ceramic
Manual and automatic control options (PLC, SCADA, 4-20mA)
Corrosion resistant design, suitable for aggressive chemicals
Easy integration with modern water treatment systems

Some popular types available:

LMI GM Series (GM0025TR1MN, GM0050PR1MNN, GM0090SP1MNN, GM0240PP1MNN, GM0240TP1MNN, GM0330PP1MNN, GM0500SP1MNN)
LMI P Series (P033-398TI, P043-358TI, P053-398TI, P063-368TI, P023-358TI)
Milton Roy G Series
LMI Electronic Metering Pump Series P

See LMI product details on the following page: LMI Dosing Pump

Download the official datasheet and brochure for technical reference:

3. OBL - Mechanical, Hydraulic and Plunger Metering Pump

OBL manufactures mechanical-diaphragm, hydraulic-diaphragm, and plunger metering pumps for different capacity and pressure duties. PT Watermart Perkasa supplies OBL series for water treatment, chemical processes, food and beverage, and mining applications based on the process data.

MB Series: Mechanical diaphragm dosing pump, flow rate 11-155 L/h, max pressure up to 12 bar
M Series: Mechanical diaphragm, flow 7-1,500 L/h, pressure up to 12 bar, food grade option
R Series: Plunger pump, pressure up to 100 bar, suitable for high viscosity liquids
XRN Series: Hydraulic diaphragm, flow 0.6-105 L/h, pressure up to 40 bar
MC/MD Series: Large capacity, PP material for chemical resistance

OBL advantages:

Wetted parts material: PP, AISI 316L, Hastelloy, PVDF, PTFE
Compact design, easy installation and maintenance
Manual and electronic actuator options
Multiplex configuration for multi-point dosing
EC 1935/2004 compliance for food & beverage applications

See OBL product details on the following page: OBL dosing-pump selection guide

Download the official OBL datasheet for technical reference:

PT Watermart Perkasa support scope

Model, part-number, and availability checks at quotation
Capacity, pressure, material, power-supply, and control-signal matching
Accessory selection for calibration columns, relief valves, and back-pressure valves
Coordination of dosing panels, PLC, or SCADA requirements when included in project scope

Common Applications of Dosing Pump

Water & wastewater treatment plant (WTP, WWTP)
Chemical, petrochemical, food-beverage, pharmaceutical industries
Cooling tower, boiler, and industrial utility systems
Laboratory, pilot plant, and research applications
Paper mills, textiles, and wastewater treatment

General Specifications of Dosing Pump

Brand	Model/Series	Flow Rate (L/h)	Max Pressure (Bar)	Material	Control
HYDROPRO	D Series	2 - 9	7 - 16	PTFE, PVC	Digital, Manual
LMI (Milton Roy)	GM, P, G Series	2 - 1800	5 - 12	PVC, PVDF, 316SS, PTFE, Viton, Ceramic	Manual, 4-20mA, ON/OFF
OBL	MB, M, R, XRN, MC, MD	0.6 - 1500	5 - 100	PP, AISI 316L, PVDF, PTFE, Hastelloy	Manual, Electronic, Pneumatic

Full Brochure and Datasheet Download

For more detailed technical information, please download the following official documents:

Contact PT Watermart Perkasa

For dosing-pump selection or a quotation, send the duty point, chemical, controls, power supply, and accessory scope to PT Watermart Perkasa by WhatsApp, email, or the website contact form.