How To Identify Leaks In Your Fibreglass Pool And How To Fix Them?

A fibreglass swimming pool is known to create an oasis in your backyard, but it can quickly create a headache if it develops a leak and even more so if they are left untreated. If you suspect your pool may be leaking let’s find out how to detect the leak and also how to deal with it.

Identifying Leaks in Your Fibreglass Pool

The first step in resolving a leak is identifying that one exists, which can sometimes be harder than it sounds. Some signs of a leak may be more obvious including a notable drop in water level, visible cracks in the fibreglass shell and unusually high water bills. Another way to detect there may be a leak is if the water area around your pool has suddenly become swampy.

The Bucket Test

This bucket test can help you determine whether your pool has a leak. Fill a plastic bucket about three-quarters of the way and mark the water level inside the bucket. Then, mark the pool’s water level on the outside of the bucket. Make sure the pool and bucket are both filled to the same level. After 24 hours, compare the two levels. If the pool water level has decreased more than the water inside the bucket, it’s likely you have a leak.

The Dye Test

The dye test is a useful method to locate leaks in your fibreglass pool. Fill a squeeze bottle with dark dye, preferably food colouring, and bring it into the pool. Turn off the filtration system for calm water. Underwater, apply dye around suspected areas – cracks, fittings, skimmers, or corners. Observe if the dye is drawn towards a specific location, indicating a leak. Use minimal dye and observe carefully. If dye disperses evenly, there may not be a leak. If quickly sucked away, it could indicate a leak. After locating the leak, you can begin repairs.

Fixing Leaks in Your Fibreglass Pool

Once you’ve identified a leak, it’s time to fix it. For minor leaks, there are a few DIY techniques you can try:

Epoxy Putty

Epoxy putty is an effective solution for minor cracks or leaks in a fibreglass pool. Simply knead the putty, apply it to the crack, and allow it to cure for the amount of time specified by the manufacturer.

Fibreglass Patch

For larger cracks or holes, a fibreglass patch may be necessary. This involves applying a layer of fibreglass cloth coated with a resin mixture directly over the leak. Once the patch has hardened, it can be sanded smooth and coated with a pool-friendly paint.

When to Call a Professional

While minor leaks can be fixed with DIY methods, larger leaks or issues that persist after your repair attempts should be addressed by a professional. A pool repair professional has the tools and expertise like Factory Pools Perth to accurately locate and repair leaks, ensuring a long-term solution.

Remember, ignoring a leak will not make it go away, it will only make it worse. It’s crucial to act quickly once a leak has been identified to maintain the longevity and safety of your fibreglass pool. Don’t let a leak turn your backyard oasis into a soggy nightmare.

Causes of Leaks in Fibreglass Swimming Pools

Structural Damage

Structural damage to the pool shell, such as cracks or fractures, can lead to leaks. These can be caused by ground movement, sharp objects hitting the pool, or even due to the pool’s age.

Faulty Plumbing

Faulty or damaged plumbing is another common cause. Pipes can become damaged over time due to various factors such as ground movement, tree roots, or corrosion.

Poor Installation

Improper installation or construction of the pool can also result in leaks. This could be due to improper sealing of the pool shell, faulty installation of the plumbing, or inadequate pool base preparation.

Wear and Tear

Over time, the wear and tear from chemicals and UV radiation can cause the pool surface to deteriorate, leading to potential leaks.

Understanding the causes of leaks in fibreglass swimming pools can help in the early detection and repair of these issues, allowing you to better maintain your pool’s health and longevity.

Preventing Leaks in Your Fibreglass Pool

Preventing leaks from happening in the first place is the best way to maintain the integrity and lifespan of your fibreglass pool. Here are some proactive measures you can take:

Regular Inspections

Conduct regular visual inspections of your pool. Look for any signs of damage, such as cracks or bubbles in the fibreglass. Also, inspect your pool equipment and plumbing for any signs of wear and tear that could lead to leaks.

Proper Chemical Balance

Maintain a proper chemical balance in your pool. Imbalances can cause the fibreglass to deteriorate over time, increasing the risk of leaks. Test your water regularly and adjust chemicals as necessary.

Protective Pool Cover

This one is an easy one! Utilise a protective cover when the pool is not in use. This can help protect the pool surface from UV radiation and debris, which can lead to damage over time. Not to mention it is a safety feature and reduces maintenance.

Professional Pool Maintenance

Consider occasional maintenance from a pool professional. Although some people may see this as an unnecessary cost as they can maintain their own pool, pool professionals can spot issues early on, potentially preventing minor problems from turning into major leaks and therefore making it worth the extra cost every so often. Remember that If you are ever in doubt just give your local specialist a call because what starts as a minor issue can become a major one if untreated.


Owning a fibreglass pool is a substantial investment, and it’s crucial to protect that investment by being proactive with care and maintenance. Regular inspections, maintaining a balanced chemical profile, protecting the pool with a sturdy cover when not in use, and investing in professional pool maintenance services can help prevent leaks and extend the life of your pool. If a leak does occur, early detection and prompt repair can prevent further issues. With proper care and attention, your fibreglass pool can provide you with years of leisure and enjoyment.