Dosing

Chemical Dosing Systems & Electro-ChlorinatorsThe right dose, every hour.

Dosing systems add exactly the right amount of chemical to water, sewage or effluent, around the clock. Electro-chlorinators make disinfectant on site from salt, water and power.

Request a proposalHow it works
  1. 01Chemical tank
  2. 02Metering pump
  3. 03Flow-paced control
  4. 04Injection point
  5. 05On-site generation
  6. 06Monitoring

What it is

In plain words.

Most treatment plants depend on chemicals added in the right amount at the right time: coagulants, pH correctors such as lime or sodium hydroxide, antiscalants, disinfectants. Too little and treatment fails. Too much wastes money and can harm the next stage. Demand also changes through the day, rising at morning peaks and falling at night, so dosing has to follow the flow.

Our dosing skids use metering pumps in duty and standby, so one keeps running while the other is serviced. Pumps can follow flow or pH signals through the plant's control system. An electro-chlorinator passes salt water through an electrolytic cell to make sodium hypochlorite on site, so you avoid storing and handling bulk chlorine. We design, supply, install and maintain both, and fix dosing faults on existing plants.

How it works

Stage by stage.

  1. Chemical tank

    The chemical is prepared and stored in a tank, with a mixer where a solution must stay uniform.

  2. Metering pump

    A duty pump delivers a measured dose. A standby pump takes over during faults or servicing.

  3. Flow-paced control

    Dose rate follows flow or a pH reading, rising at peak demand and falling at night.

  4. Injection point

    The chemical enters the pipe or tank through an injection fitting, where it mixes with the water.

  5. On-site generation

    In an electro-chlorinator, brine passes through an electrolytic cell to make sodium hypochlorite.

  6. Monitoring

    Level, flow and residual readings confirm the dose, with alarms if a pump fails or blocks.

Options

Built to suit the site.

  • Coagulant dosing

    Feeds alum or similar coagulants ahead of clarifiers and filters in water and effluent plants.

  • pH correction

    Doses lime or sodium hydroxide to bring water or effluent to the right pH for treatment or discharge.

  • Disinfectant dosing

    Feeds sodium hypochlorite in proportion to flow for drinking water and treated sewage.

  • Electro-chlorinator

    Makes sodium hypochlorite on site from salt by electrolysis, removing the need to store bulk chlorine.

Where it's used

Industries and sites.

  • Water treatment
  • Sewage treatment
  • Industrial effluent
  • Power stations
  • Mining
  • Building services
  • Public infrastructure

See how we work with each industry →

What we deliver

One team, from survey to service.

  • 01

    Design

    Survey, water or effluent analysis, process design and sizing for your site.

  • 02

    Build

    Supply, fabrication, civil and mechanical works, installation and commissioning.

  • 03

    Automate

    PLC, SCADA and remote monitoring, so the plant can be seen and controlled from anywhere.

  • 04

    Maintain

    Operation, preventive maintenance and AMC under Zeal-Care, with written reports.

Questions

Asked before every project.

Why have a standby pump?

Metering pumps have wearing parts that need servicing. A standby pump keeps dosing going while the duty pump is repaired, so treatment does not stop.

What is an electro-chlorinator?

It makes sodium hypochlorite on site by passing an electric current through salt water. You buy salt instead of bulk chlorine or bleach, and avoid storing and handling it.

Can you fix dosing on a plant someone else built?

Yes. If pumps fail, block or dose inaccurately, we find the cause and repair or replace what is needed, then can maintain it under an AMC.

Water treatment

Often built together.

Tell us about your site.

Share your flow, location and timeline. An engineer will review your requirement and call you back within one working day.

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