27 Must-Know Terms for New Pool Owners

Thinking about joining the world of fibreglass pools? You might feel like you’ve stumbled into a whole new language of coping, skimmers, gelcoats... What the heck does it all mean?

Don’t stress, we’ve got you.

This beginner-friendly glossary will help you decode all the fibreglass pool jargon so you can chat like a seasoned pool pro (and maybe even impress the neighbours while you’re at it).

Whether you’re planning your DIY plunge pool, shopping for the right gear, or just getting your head around how it all works, this guide has you covered — packed with expert tips and a few cheeky Aussie nods to keep it light.

Here’s what you can expect:

• Straight-talk explanations (no eye-glazing tech waffle here)
• Practical advice you can actually use
• Little insider tips to help you look like you’ve done this a dozen times before
  
  

What is a Fibreglass Pool?

A fibreglass pool is a pre-moulded swimming pool crafted from multiple layers of strong fibreglass and high-quality resin, finished with a smooth, protective gelcoat that gives it that signature shine.

They’re loved for being low-fuss, quick to install, and built to last the distance, especially when compared to concrete or vinyl liner pools. They resist algae, use fewer chemicals, and don’t need resurfacing like concrete pools. If you want more splash time and less maintenance, a fibreglass pool might be your backyard’s best mate.

 "Fibreglass pools aren't just easier to install. They're designed to thrive in the toughest backyard conditions - no matter the soil, sun, or weather conditions in your part of Australia.” 

Pool Construction Terms You’ll Want to Know

Fibreglass Pool Shell   

The shell is the one-piece, pre-moulded fibreglass structure that forms the body of your swimming pool. It arrives fully formed and ready to drop into your backyard hole—no tiling, no steel mesh, no curing time.

Your fibreglass pool shell includes:

• A skimmer box
• Two filtration return jets
• A built-in hydrostatic valve (to manage groundwater pressure)
  

Why it matters:
This is the core of your pool—so quality counts. Top-quality fibreglass pools have flat, non-reinforced walls, smooth, rounded corners, and are backed by a 35-year structural warranty.

Pro tip: Not all shells are created equal. Don’t get ripped off. A shell with a 25-year structural warranty can advertise as having a “lifetime warranty”. Look for fibreglass pools with a 35-year structural warranty so you know they’re engineered for Aussie backyard conditions.

Safety Ledge 

A safety ledge is a horizontal 50mm - 100mm reinforcing ledge built into the inside walls of some fibreglass pool shells. It runs around the entire pool about 200mm below the waterline and is often pitched as a “safety feature” for kids or nervous swimmers.

Why it matters:
Despite the marketing folk trying to pull the wool over your eyes, it’s there to compensate for thinner or weaker pool walls. It also takes up valuable swim space and constantly collects dirt that needs constant brooming. While it might sound like a bonus, in reality most pool owners will say it isn’t.

Pro tip: Not all fibreglass pools include safety ledges—and that’s not a bad thing. Stronger shells don’t need them.

Gelcoat

The gelcoat is the glossy outer layer on fibreglass pools - the bit you see, touch, and admire. It’s applied over the structural layers and gives the pool its smooth surface and vibrant colour.

Why it matters:
A premium gelcoat protects against UV rays, chemical damage, and algae. It also determines how long your pool will look fresh and how often you’ll need to clean it. High-performance Australian-made gelcoats like AquaGuard-X™ offer richer colour and better fade resistance, keeping your pool looking new for decades.

Pro tip: Gelcoat is non-structural and is covered by the manufacturer's cosmetic warranty. Always ask how long the cosmetic warranty is and if there are onerous conditions like having to have your pool water quality tested every week for it to be valid.

Osmosis

In fibreglass pools, osmosis refers to the gradual intrusion of water through the gelcoat or the underlying fibreglass layers. Over time, this can lead to small bubbles or blisters forming beneath the surface of the gelcoat - often called "osmotic blisters." Basically your pool looks like it has a bad case of pimples.

It typically happens when the gelcoat is compromised or when poor manufacturing practices allow water to seep into tiny gaps in the fibreglass laminate.

Why it matters:
While osmosis won’t cause fibreglass pools to leak, it is a sign of pool manufacturing standards. Osmosis looks terrible and overtime will cause your gelcoat layer to fail.

High-quality fibreglass pools manufactured to AS1838:2021 are engineered to eliminate osmosis with advanced vinyl ester resins and barrier coatings.

Pro tip: If a manufacturer doesn’t mention osmosis protection in their warranty, that’s a sign to dig a little deeper.

Rounded Corners

These are the smooth, curved internal angles where the pool walls meet the floor—also known as the pool’s “radius” or “radius corners.”

Why it matters:
Rounded corners are a sign of structural strength. Stronger fibreglass shells can support these curves naturally, while weaker shells often rely on square corners to act as reinforcement points.

They’re also easier to install and maintain—rounded edges don’t trap dirt, they’re robot-vacuum friendly, and they give the pool a softer, more modern look.

Pro tip: If you see sharp, square corners in a fibreglass pool, ask why. It could be a sign that the shell relies on them for strength—something to think about before you buy.

Bond Beam 

The bond beam is a thick, reinforced concrete ring poured around the top edge of your fibreglass pool shell during installation. It connects the pool to the surrounding paving, coping, or decking.

Why it matters:
The bond beam locks the fibreglass shell in place and gives your pool long-term stability. It prevents movement over time and helps distribute weight evenly—especially important if your pool is surrounded by heavy stone, pavers, or traffic. It also provides the structural base for any finishing touches around the pool’s edge.

Pro tip: Allow the backfill around your pool to settle for at least 7 days before pouring the bond beam.

Pool Equipment Terms You’ll Definitely Hear About

Filtration System   

The filtration system is the setup that keeps your pool water clean, clear, and safe to swim in. It includes a pool pump, a filter (usually sand or cartridge), and an automated sanitiser such as a saltwater or mineral chlorinator or a freshwater system.

Why it matters:
Without a proper filtration system, your pool water would quickly turn cloudy or green. A good setup keeps water circulating, removes debris, and helps the sanitiser do its job - all with minimal effort from you.

Pro tip: Make sure your system matches your pool’s size. Undersized gear can lead to murky water and overworked pumps, while a properly sized system means less maintenance and more swim time.

Variable-Speed Pump

A variable-speed pump speed can be adjusted depending on how much water flow is needed. Unlike single-speed pumps that run at full throttle all day, this smart pump can on a low speed for day to day filtration and high speed when vacuuming the pool - saving energy and wear on the system.

Why it matters:
These pumps are very quiet, last considerably longer than a single-speed pump, and can cut your pool’s energy use by up to 85%. That will save you hundreds (or even thousands) on your annual power bill.

Pro tip: Some states offer rebates for energy-efficient pool pumps, so check what’s available in your area before you buy.

Hydrostatic Valve

A hydrostatic valve is a small pressure-release valve installed in the deepest part of fibreglass pools. Its job is to stop rising groundwater from pushing the pool shell upwards, especially during heavy rain or in areas with a high water table.

Why it matters:
Without a hydrostatic valve, a fibreglass pool could “pop” or lift out of the ground if groundwater pressure builds up underneath it. It’s a small piece of hardware, but it plays a big role in protecting your investment.

Pro Tip: A hydrostatic valve is not needed if you are installing a fibreglass pool into free-draining material like sand.

Skimmer Box

The skimmer box the rectangular opening in the deep end of fibreglass pools that is usually half below the water line and half above it. Using your pool pump, it pulls in surface water and collects floating debris like leaves, bugs, and other gunk before it sinks to the bottom.

Why it matters:
It’s your pool’s first line of defence against cloudy water and clogged filters. A working skimmer reduces the load on your filtration system and cuts down your cleaning time - especially during autumn or after a windy day.

Pro tip: Keep the skimmer basket clean. If it backs up, water circulation drops and your whole system has to work harder than it should.

 “Fibreglass pools are meant to be low-fuss. If someone’s making it sound complicated, they’re doing it wrong.” 

Water Chemistry Terms Made Simple

pH Level

Your pool’s pH level measures how acidic or alkaline the water is, on a scale from 0 to 14. The sweet spot for swimming pools is between 7.2 and 7.8—just slightly alkaline.

Why it matters:
If your pH is too low (acidic), it can sting eyes, corrode equipment, and mess with your sanitiser. Too high (alkaline), and you’ll get cloudy water, scale build-up, and ineffective chlorine.

Pro tip: Test your water weekly during the swimming season. Keeping pH in the right range makes your pool safer, more comfortable, and cheaper to maintain in the long run.

Chlorine 

Chlorine is the most common pool sanitiser. It works by oxidising contaminants—breaking down bacteria, algae, sweat, oils, and other nasties so they can be filtered out.

Why it matters:
Without chlorine, your pool becomes a breeding ground for germs. But it’s not just “set and forget”—chlorine’s effectiveness depends on the pH level of your water. If your pH is off, your chlorine won’t work properly, and you’ll end up wasting time and chemicals.

There are a few different types of chlorine available (granular, liquid, tablets, or automatic via a chlorinator), and not all of them suit every pool setup.

Pro tip: Ask your local pool shop or fibreglass pool supplier which type of chlorine is right for your setup. And remember—more isn’t always better.

Algaecide 

Algaecide is a chemical treatment designed to prevent or kill algae in your pool water. It acts as a backup to your regular sanitiser—especially during warmer weather or after heavy rain when algae can thrive.

Why it matters:
Algae can turn a clean pool into a green swamp surprisingly fast. While chlorine usually does the heavy lifting, algaecide adds another layer of protection.

Bonus for fibreglass pool owners:
Because fibreglass surfaces are smooth and non-porous, algae can’t grip as easily - so you’ll use way less algaecide than you would with a concrete pool.

Pro tip: Use it sparingly. More algaecide doesn’t equal cleaner water—it can actually foam things up if you overdo it.

DIY Installation Terms You’ll Come Across

Excavation 

Excavation is the first big step in your DIY pool installation—it’s the digging stage where the hole for your fibreglass pool shell is created.

Why it matters:
Getting the excavation right is critical. The hole must match your dig sheet dimensions precisely and with the correct depth.

Pro tip: Always double-check measurements before digging. A miscalculated depth or uneven base can lead to delays, extra costs—or worse, a crooked pool.

Crusher Dust

Crusher dust is a fine, crushed rock material commonly used in two key stages of a fibreglass pool install: beneath the pool shell as a bedding layer, and around the shell for backfilling.

Why it matters:
Under the shell, it forms a flat, level bedding surface—but it must not be compacted. The pool shell itself settles into place naturally when water is added during installation. Around the pool shell, crusher dust can also be used for backfilling, but it must be cement-stabilised to meet AS1839:2021 compliance standards.

Pro tip: Materials other than crusher dust can be used for the bedding layer and are compliant with AS1839:2021

Backfilling

Backfilling is the process of filling the space between the outside of your fibreglass pool shell and the edge of the excavation.

Why it matters:
This step locks a fibreglass pool in place and supports it once water is added. To meet AS1839:2021, you must use cement-stabilised material for backfilling. This provides the right amount of stability and drainage while protecting the shell from movement, bulging, or structural stress.

Pro tip: Mix the cement into the backfill material onsite as you go. If you have pre-mixed material delivered, use it all during one day otherwise overnight damp will start the process of the cement going har.d 

Temporary Fencing

Temporary fencing is required on pool sites during construction to keep the area safe and compliant. It becomes mandatory once your pool contains 300 mm or more of water, but in some regions, councils may also require fencing around the excavated hole - even before the fibreglass pool shell is installed.

Why it matters:
Unfenced pool sites can be dangerous. An open excavation presents a serious fall hazard, especially on residential blocks. And once water enters the pool (even partially), you’re legally required to install compliant temporary fencing until permanent safety barriers are in place.

Pro tip: Check with your local council before you start digging. Rules can vary across states and even between councils—and getting it wrong could delay your project or attract fines.

“Ask about the warranty. Ask about the backfill. Ask about the gelcoat. If a supplier can’t answer clearly, they’re not the right one.”

Compliance and Certification Terms You Should Know

AS1838:2021Swimming Pools – Premoulded Fibre-Reinforced Plastics – Design and Fabrication

AS1838:2021 is the Australian Standard that governs the structural integrity of fibreglass pool shells. It outlines strict requirements for wall thickness, shell strength, hydrostatic valves, and overall manufacturing quality.

Why it matters:
This standard exists to ensure fibreglass pools are built tough enough to handle Australia’s harsh conditions—like expanding clay soils, UV exposure, and big seasonal rainfall. Pools that don’t meet this standard may not perform as expected.

Pro tip: Always confirm that your shell complies with AS1838:2021. Reputable suppliers will back their pools with certification and a clear structural warranty—if they don’t, that’s your cue to keep shopping.

AS1839:2021 – Swimming Pools – Premoulded Fibre-Reinforced Plastics – Installation

AS1839:2021 is the Australian Standard that outlines how fibreglass pools must be installed. It covers everything from backfilling methods and temporary support during installation.

Why it matters:
Even the best pool shell can fail if it’s installed poorly. This standard ensures your pool is installed in a way that protects its structural integrity and long-term performance. It’s especially important for DIYers, because it details requirements like cement-stabilised backfill, non-compacted bedding, and the use of a hydrostatic valve—all critical for compliance and warranty protection.

Pro tip: If you’re installing your own pool, get familiar with AS1839:2021. Following it helps ensure your install passes inspection, avoids costly issues, and keeps your warranty intact.

Council Approval

Council approval is the official green light from your local council to install a permanent swimming pool on your property. It ensures your pool complies with planning regulations, zoning laws, and safety codes in your area.

Why it matters:
You can’t legally start digging - or fill a pool with water - without this approval. It usually includes checks on fencing, site setbacks, drainage, and how the pool affects neighbours or easements.

Approval timeframes vary but generally take 4 to 10 weeks, depending on your local council’s workload and whether they need additional documentation.

Pro tip: Before you lodge your application, double-check what supporting documents your council requires—like site plans, fencing details, or engineer’s drawings. Missing paperwork is one of the most common reasons approvals get delayed.

Dive In with Confidence 

Owning a fibreglass pool is one of the best lifestyle upgrades you can make—and now that you’ve got the lingo sorted, you’re in a solid position to plan, install, or maintain yours with confidence.

From skimmers and shell strength to hydrostatic valves and council approvals, these key terms aren’t just technical—they’re the foundation of a smoother pool journey. Whether you're going DIY or just want to sound like you know your stuff, understanding how your pool works means fewer surprises and better long-term decisions.

And if you’re still wrapping your head around things - no worries. At Complete Fibreglass Pool Kits, we’re here to help explain anything that doesn’t make sense, as many times as you need without the jargon so you feel confident and informed.

“We don’t expect you to be a pool expert—but we’ll explain everything until it all makes sense. That’s our job.”