An Extra Layer of Pool Safety

Pool safety gates and fencing are the first line of defence around a home swimming pool, but they're not infallible. Gates can be left open, children can find ways to climb, and accidents happen in seconds. Pool alarm systems provide an additional layer of protection by detecting when someone or something enters the water — and alerting you before it's too late.

This guide explains the main types of pool alarms, how each one works, their strengths and limitations, and what to look for when choosing one.

Types of Pool Alarm Systems

1. Surface Wave / Subsurface Alarm

These alarms float in the pool and use sensors to detect waves or disturbances in the water. When a child or object falls in, the resulting wave triggers the alarm. They are easy to install and remove, making them a popular choice for above-ground pools and rental situations.

Pros: Simple to use, no permanent installation required, relatively affordable.
Limitations: Can be triggered by wind, rain, or pool equipment. Less effective at detecting a slow, quiet entry.

2. Subsurface Immersion Alarms

More sensitive than surface wave alarms, subsurface sensors are positioned below the waterline and detect pressure changes caused by an object entering the water. These are designed to reduce false alarms from wind and surface disturbances.

Pros: Fewer false alarms than surface alarms, more sensitive detection.
Limitations: Still not immune to false triggering from pool pumps or heavy rain.

3. Wristband / Immersion Alarms

These wearable alarms are worn on a child's wrist. When the wristband is submerged in water, it triggers an alarm both on the wristband itself and on a base receiver unit kept indoors or with a supervising adult.

Pros: Child-specific detection means fewer false alarms. Effective regardless of how the child enters the water.
Limitations: Relies on the child wearing the band — not suitable as a standalone safety measure.

4. Gate and Door Alarms

These alarms are attached to pool gates, fences, or doors that provide access to the pool area. They sound when the barrier is opened. While they don't detect entry into the water, they alert you the moment someone is attempting to access the pool unsupervised.

Pros: Early warning before a child reaches the water. Simple and cost-effective.
Limitations: Do not detect falls or unauthorised entry that bypasses the gate.

5. Infrared Perimeter Alarms

These systems use infrared beams or motion detection around the pool perimeter. When the beam is broken — by a person crossing into the pool zone — the alarm is triggered.

Pros: Provides detection before pool entry, not just after. Can cover large areas.
Limitations: Can be triggered by animals or wind-blown objects. Requires more complex installation.

What to Look For When Choosing a Pool Alarm

  • Sensitivity settings: Can you adjust the alarm to minimise false triggers from weather or pool equipment?
  • Alarm volume: The alert must be loud enough to be heard throughout the house, even with doors and windows closed.
  • Remote receiver: Does the system include a remote unit that can be kept inside the home?
  • Reset function: Can you easily mute and reset the alarm after a false trigger without accidentally disabling it?
  • Compliance: Check whether alarms in your area are required to meet specific standards — some regions mandate pool alarms by law.

Pool Alarms Are a Supplement, Not a Substitute

It's important to understand that no alarm system replaces active adult supervision or a properly installed pool safety fence and gate. Alarms add valuable seconds of warning time, but a child can lose consciousness in the water very quickly. The most effective pool safety strategy uses multiple layers: fencing, gates, alarms, and vigilant supervision together.

Evaluate your specific situation — the ages of children in or near the home, the layout of your yard, and the proximity of the pool to the house — and choose an alarm type (or combination of types) that fits your needs.