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—Pumps, filtration and plant

UV and ozone pool systems

UV and ozone treat water as it passes through the plant. They work alongside chlorine rather than replacing it.

Ultraviolet (UV) systems pass water through a chamber where UV light treats micro-organisms in the flow. Ozone systems inject ozone gas, a strong oxidiser, into the water in the plant. Both act only on water passing through the equipment, so a residual sanitiser such as chlorine is still needed in the pool itself.

Equipment guides are about choosing, sizing and installing plant, not about day-to-day pool care.

Owners often consider them to reduce chlorine demand and improve water feel. Installation involves placing the unit in the return line, sized for the flow, with electrical supply and, for ozone, safe off-gassing arrangements. Maintenance includes replacing UV lamps or servicing ozone generators.

01Summary

What matters most here

  • Treat water in the plant

    As it passes through.

  • Chlorine still needed

    For residual sanitation in the pool.

  • Size for flow

    Units matched to the pump.

02Detail

How they fit in

  • UV chambers

    Fitted in the return line after the filter, where the water is clearest and the UV light can reach it.

  • Ozone injection

    Ozone is injected and mixed in the plant, with arrangements so that any excess gas is safely released before the water returns to the pool.

  • Electrical supply

    For lamps or generators.

  • Upkeep

    Lamp replacement or generator servicing.

03Before you start

Before adding

  • Check flow rate

    For sizing.

  • Plan plant space

    For the unit.

  • Understand upkeep

    Lamps and servicing.

—In practice

How to use this

Decide what you want UV or ozone to achieve, then have the system sized to the flow rate through the plant. Plan its position, power supply and maintenance, since UV lamps and ozone generators have service intervals. Remember that a residual sanitiser is still needed in the pool water itself, so the system works alongside chlorine.

Mistakes worth avoiding

Expecting to stop using chlorine
UV and ozone treat water only as it passes through the plant. A residual sanitiser is still needed in the pool.
Ignoring maintenance
Lamps and generators lose effectiveness without service. Include their upkeep in the decision from the start.

04FAQ

Common questions about this

Can UV replace chlorine?
No; it treats water in the plant only.
Does ozone smell?
Systems are designed to manage off-gassing safely.
Are they suitable for villas?
They can be added to villa systems.
Do UV lamps need replacing?
Yes, periodically, according to the manufacturer.
Do they change how the water feels?
Many owners report that water feels softer and smells less of chlorine, though results vary.

05Read next

More pool guides on this

Filed under pump & filtration systems. Every pool guide is listed on the pool guides page.

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