Chemical dosing & biocide control

Dosing pumps, controllers, bleed valves and probes: supplied, set up and looked after, so the right amount of chemical goes in at the right time.

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Dosing & control

A great programme on paper is no use if the pump's stopped.

Most cooling tower problems we're asked to look at come down to dosing. A pump that's lost its prime. A suction lance sitting in an empty drum. A conductivity probe so coated it reads half what it should. A bleed valve stuck shut. None of it is dramatic, but any of it can let things slide quickly.

We supply and install dosing equipment, set it up for your system, and maintain it on every visit. That includes the controller that decides when to bleed, the timers that run your biocide shots, and the probes that tell it what's going on.

If you'd like to know what goes wrong most often, our engineers talk about it in the blog, and the treatment programme page explains how dosing fits into the bigger picture.

  • Dosing equipment supply and installation

    Pumps, controllers, injection points, bunded chemical storage and pipework, sized for your system.

  • Conductivity and bleed control

    Probes and controllers that bleed off concentrated water at a set point, so you don't scale up or waste water.

  • Biocide dosing regimes

    Alternating oxidising and non-oxidising biocides on timers or proportional to make-up, with pre-bleed lockout where needed.

  • Inhibitor dosing

    Dosed in proportion to make-up water, so the reserve stays where it should be.

  • Routine equipment maintenance

    Pump checks, calibration of probes, cleaning of injection points and replacing worn parts.

  • Chemical stock checks

    We keep an eye on drum levels so you don't run dry between visits.

Questions

Chemical dosing & biocide control: common questions

How do I know if my dosing system is working?

Your weekly checks should include a quick look at drum levels, pump operation and the controller readout. Falling biocide or inhibitor reserves and rising dip slide counts are the usual warning signs. We check and calibrate the kit on every service visit.

Why use two different biocides?

HSG274 Part 1 recognises that alternating biocides helps stop a bacterial population adapting to one chemical. A common approach is an oxidising biocide plus a non-oxidising one, but the right choice depends on your system and water.

What is bleed control and why does it matter?

As water evaporates, dissolved solids build up. The controller measures conductivity and bleeds off some system water when it gets too high, replacing it with fresh make-up. Too little bleed and you get scale; too much and you waste water and chemicals.

Can you service dosing equipment another company installed?

Usually, yes. We'll check what's fitted, confirm it's suitable and tell you honestly if anything needs replacing.

Want a second pair of eyes on your cooling system?

Tell us about your system and we'll come back with a clear, itemised quote. No hard sell, just a straight answer on what your site needs.

Call 020 3633 6064