Pool Losing Water

Is It Normal for a Pool to Lose Water?

Before assuming there’s a problem, it helps to understand how much water loss is actually normal for a pool - especially in Australia’s climate.

Normal Evaporation in Australian Conditions

Yes - every pool loses water naturally through evaporation. In warmer parts of Australia, it’s common to lose around 3–5mm per day, especially during summer.

Several factors can increase evaporation:

• Hot weather and direct sun exposure

• Wind moving across the pool surface

• Heated pools, which evaporate faster

• Frequent use and splashing

• Not using a pool cover

Think of it like leaving a glass of water outside on a hot day - it slowly disappears. Your pool behaves the same way, just on a larger scale.

When Water Loss Becomes a Problem

Water loss may point to a leak if:

• You’re losing more than 5–7mm per day

• The level drops quickly over a short period

• You’re refilling more often than usual

• The water continues to drop even when the pool isn’t in use

If the loss feels excessive or unpredictable, it’s worth investigating.

Signs Your Pool May Have a Leak

Some leaks are obvious. Others are easy to miss.

Here are common signs to watch for:

• Water level dropping faster than expected

• Wet, soft, or sinking ground around the pool

• Cracks in the pool shell, tiles, or surrounds

• Air bubbles in the return lines or reduced circulation

• Algae growth from inconsistent water levels

• Higher-than-usual water bills

• Constant need to top up the pool

If you’re noticing more than one of these, a leak is likely.

What Causes a Pool to Lose Water?

Leaks can come from several areas - many of them hidden from view.

Structural Issues

Cracks can develop in the pool shell or along the tile line over time. Ground movement and ageing materials often play a role, allowing water to escape slowly.

Plumbing Leaks

Underground pipes are a common source of leaks. These can occur in suction or return lines and usually aren’t visible from the surface.

Equipment Problems

Faulty pumps, filters, or valves can leak during operation. Issues with backwashing systems can also lead to unnoticed water loss.

Skimmers & Fittings

Skimmer boxes, light fittings, and other penetrations are frequent leak points. These areas can weaken or separate over time.

Because many of these problems aren’t visible, pinpointing the exact cause typically requires specialist equipment.

How to Tell If It’s a Leak or Just Evaporation

Before calling a professional, there are a few simple checks you can try.

The Bucket Test Explained

The bucket test is a quick way to compare evaporation with actual water loss:

1. Fill a bucket with pool water

2. Place it on a pool step so the water level inside matches the pool

3. Mark both levels

4. Wait 24–48 hours

If the pool water level drops more than the bucket, a leak is likely.

Additional Simple Checks

• Look for damp areas around the pool

• Check equipment for visible drips

• Monitor how often you need to refill

Limitations of DIY Checks

These checks can indicate a problem, but they won’t tell you where the leak is. Underground or structural leaks often go undetected, and results can sometimes be misleading.

If you’re still unsure, it’s best not to rely on guesswork.

When to Call a Pool Leak Detection Specialist

There’s a point where ongoing testing and refilling stops being helpful.

You should consider calling a specialist if:

• Water loss exceeds normal evaporation

• The bucket test suggests a leak

• You’re topping up frequently

• There are signs of structural or underground issues

• You’re preparing to buy or sell a property with a pool

A professional can locate the issue accurately - without unnecessary digging or trial-and-error repairs.

Speak with a Leak Detection Specialist

How Leak Stoppers Finds Pool Leaks (Without Guesswork)

Leak Stoppers focuses on accurate diagnosis first - so you’re not paying for repairs you don’t need.

Non-Invasive Leak Detection Methods

Specialist techniques are used to locate leaks without damaging your pool or surrounds:

• Dye testing to track water movement

• Pressure testing for plumbing systems

• Underwater inspections by trained divers

Why Accurate Detection Matters

Pinpointing the exact source of the problem helps avoid unnecessary excavation, reduces misdiagnosis, and leads to faster, more effective repairs.

What You Get From a Leak Detection Visit

• Clear identification of the leak location

• A straightforward explanation of the issue

• Practical next-step recommendations

What Happens After Detection

If repairs are needed, you’ll be connected with trusted professionals who can carry out the work properly, keeping the process simple and clear.

Why Acting Early Saves You Time, Money, and Water

A small leak might not seem urgent - but it rarely stays that way.

Left unchecked, leaks can:

• Cause structural damage to your pool and surrounding areas

• Lead to higher repair costs over time

• Waste significant amounts of water

• Disrupt chemical balance, increasing maintenance costs

In Australia, where water conservation matters, addressing leaks early is both practical and responsible.

FAQs About Pool Water Loss

How much water loss is normal in a pool?

In most Australian conditions, around 3–5mm per day is normal due to evaporation. Higher levels may indicate a leak.

How do I know if my pool is leaking or evaporating?

The bucket test is a simple way to compare water loss. If your pool loses more than the bucket, a leak is likely.

How much water loss per day is too much?

Consistent loss above 5–7mm per day usually signals a problem.

Can a pool leak underground?

Yes. Many leaks occur in underground plumbing, which makes them harder to detect without specialist equipment.

Where do pools most commonly leak?

Common areas include pipes, skimmers, light fittings, and structural cracks in the pool shell.

Is a pool leak expensive to fix?

Costs vary depending on the cause. Detecting the issue early usually keeps repairs simpler and more affordable.

Should I keep filling my pool if it’s leaking?

Occasional top-ups are fine, but ongoing refilling wastes water and can hide the problem. It’s best to have it properly checked.