Parts of a Pool: Every Component Named and Explained

A pool has about a dozen named parts. The structure itself is the shell — floor, walls, steps and seats — finished at the top edge by the coping. Hidden in the ground is the circulation loop: the skimmer, main drain, suction lines, pump, filter, sanitiser, return lines and return jets. Everything else, from lights to spa jets, is an optional extra bolted onto one of those two systems.

Here's every part, what it's called, and what it actually does.

Pool part names at a glance

Part	Where it is	What it does
Shell	The structure you swim in	Holds the water; in a fibreglass pool it's one moulded piece
Floor	The bottom of the pool	Slopes from the shallow end to the deepest point
Steps, seats and swimouts	Moulded into the shell	Entry, resting spots and a ledge for climbing out at the deep end
Coping	The edging around the top	Caps the shell's lip and ties it into the paving
Waterline	The top 150 mm or so of the walls	Where scum and mineral lines form — the strip you'll wipe down
Skimmer	A box in the wall at water level	Pulls floating leaves and oils off the surface
Main drain	The floor, at the deepest point	Draws water from the bottom into the circulation loop
Suction lines	Buried pipework	Carry water from skimmer and drain to the pump
Pump	On the equipment pad	Pushes water around the whole loop
Filter	On the equipment pad	Strips out dirt, dust and fine debris
Sanitiser	On the equipment pad	Chlorinates or mineralises the water so it's safe to swim in
Return lines	Buried pipework	Carry cleaned water back to the pool
Return jets	Small fittings in the walls	Push clean water back in and keep it circulating

The shell — the part you swim in

The shell is the pool. In a fibreglass pool it arrives as a single moulded piece: a smooth gelcoat swimming surface on top, a vinyl-ester barrier layer behind it to stop water migrating into the laminate, and structural layers of fibreglass beneath that. There's no liner to replace and no interior render to redo — the surface you swim on is the shell itself.

Because the whole thing comes out of a mould, features that are separate construction jobs in a concrete pool are simply part of the shape: entry steps, seats and benches along the walls, and swimouts — the ledge at the deep end you can stand on to climb out. When you compare pool designs, you're really comparing shell shapes and how those features are arranged.

The floor is exactly what it sounds like, and it's the answer to a question we get asked in odd ways: the bottom of the pool doesn't have a special name. It slopes from the shallow end down to the deepest point, which is where the main drain sits.

Around the edge — coping and the waterline

Coping is the edging that runs around the top of the pool. On a fibreglass pool the shell finishes in a horizontal lip; coping caps that lip and joins it to the surrounding paving or deck. It can be poured concrete, pavers or natural stone, and it's the detail that most changes how finished a pool looks.

The waterline is the top strip of the walls where the water surface sits. Sunscreen, body oils and dust collect here, so it's the one part of the shell you'll actively wipe down. Gelcoat's non-porous surface makes that a two-minute job — one of the quieter advantages over concrete, where the porous interior grabs onto scale.

The circulation loop — seven parts, one job

Water leaves the pool dirty and comes back clean. Seven parts make that happen, in order:

1. The skimmer

The skimmer is a box set into the wall at water level that pulls the surface of the pool into the plumbing, catching leaves, twigs and oils in a basket before they sink. It's your first line of defence against a dirty floor — here's how a skimmer works in detail.

Empty the basket regularly, and don't rely on it after weather. A South East Queensland summer storm can dump more leaf litter in an hour than the skimmer clears in a day; grab the leaf scoop, then check your chlorine, because organic debris eats sanitiser.

2. The main drain

The main drain sits in the floor at the deepest point and draws water from the bottom of the pool into the loop. Without it, the deep end barely circulates and becomes the spot where algae starts.

Suction points are a safety item, not just a plumbing one — drains must be fitted with compliant anti-entrapment covers under AS 1926.3, the Australian standard for pool water recirculation systems. On a new pool this is handled at install; on an older pool, a cracked or missing drain cover is worth fixing immediately.

3. The suction lines

Buried pipes that carry water from the skimmer and main drain to the pump. They need almost no attention — if the pump is pulling air or losing prime, a suction-side leak or blockage is the usual suspect.

4. The pump

The pump is the heart of the loop: it pulls water through the suction lines and pushes it through the filter and back to the pool. Every pool we install runs a variable-speed pump, which spins slower for everyday filtering and faster for vacuuming — running a variable-speed pump at low speed for longer filters the same water for a fraction of the electricity of an old single-speed unit.

Weekly, empty the pump's lint basket. If it starts screaming or leaking at the fittings, deal with it early — a pump run dry destroys its own seals.

5. The filter

The filter strips dirt, dust and fine debris from the water. Two types dominate Australian residential pools:

• Cartridge filters pass water through pleated elements with a large surface area. No backwashing, so no water down the drain — you pull the cartridge out and hose it off a few times a season.
• Media filters push water through a tank of filtration media. Traditionally that media was sand; we run crushed glass media instead, which filters finer and backwashes cleaner.

Which is right depends on your setup — filter care is covered in our maintenance guide. Cartridge suits most backyard pools; media suits heavy-debris sites and anyone who prefers backwashing to hosing.

6. The return lines

The mirror image of the suction lines: buried pipes carrying filtered, sanitised water back to the pool. Like the suction side, they're maintenance-free unless something leaks.

7. The return jets

The small directional fittings in the walls where clean water re-enters. They're aimable — angle them slightly downward and all in the same rotational direction and the whole pool turns over in a slow spiral, sweeping debris toward the skimmer instead of letting it settle. If one corner of your pool always collects leaves, the jets are usually aimed wrong.

The sanitiser — the part that makes water safe

Filtering removes physical debris; the sanitiser kills what you can't see. On the equipment pad, next to the pump and filter, most Queensland pools run one of:

• A salt chlorinator, which converts pool salt into chlorine as the water passes through its cell.
• A mineral system, which does the same job with a magnesium-based blend that's noticeably softer on skin and eyes — our magnesium pool guide covers the differences.
• A freshwater system with a pH controller, which sanitises at a fraction of the salt level and doses acid automatically.
• UV sanitation as a supplement — an ultraviolet chamber that neutralises chlorine-resistant organisms as water passes through. We fit the Quantum UV unit as a $3,100 add-on for owners who want lower chlorine reliance.

Whatever the system, it only works on moving water — which is why the pump run time matters more than any chemical you add. Keeping the pool clean is mostly keeping it circulating.

What comes included with a fibreglass pool

When we hand over a pool, the circulation loop arrives complete. Every package includes the variable-speed pump, your choice of cartridge or glass-media filter, the sanitiser system, an LED pool light wired in during the build, and a handover kit — telescopic pole and cleaning attachments, a water test kit and start-up chemicals, so the first water balance happens with us standing next to you, not from a YouTube video.

That matters when you're comparing quotes: a pool price that excludes the equipment pad isn't a pool price. It's also a difference from above-ground pool kits, where the filtration is usually the flimsiest part of the package.

Optional parts worth knowing by name

Beyond the essentials, a handful of add-ons come up in nearly every design conversation: spa jets for a seat that massages, deck jets that arc water into the pool, hand grab rails for easier entry, a skimmer overflow that sends stormwater to the drain instead of over your paving, and an ultra drain for high-rainfall sites. Current installed prices:

None of these names are jargon we invented — they're standard trade language, the words on the boxes in any pool shop. If a part fails, name it correctly and you'll get the right replacement first go; our pool maintenance guide covers the service schedule for each one, how solar heating fits into the loop is its own topic, and there's plenty more in our pool tips library.

Ready to see the parts assembled into an actual pool? Book a measure and quote and we'll walk the site with you.

FAQs

What is the drain at the bottom of a pool called?

It's called the main drain. It sits at the deepest point of the floor and draws water from the bottom of the pool into the circulation system. In Australia it must be fitted with a compliant anti-entrapment cover under AS 1926.3.

What are the jets on the side of a pool called?

They're return jets (sometimes called return inlets or eyeballs, after the swivelling fitting). They push filtered, sanitised water back into the pool and can be aimed to set up a circular flow that sweeps debris toward the skimmer.

What is the edge around the top of a pool called?

The coping. It's the border — usually concrete, pavers or stone — that caps the top lip of the pool shell and connects it to the surrounding paving or deck.

What parts come included when you buy a fibreglass pool?

With our pools, the full circulation loop is included: a variable-speed pump, a cartridge or glass-media filter, the sanitiser (chlorinator, mineral or freshwater system), an installed LED light, and a handover kit with a telescopic pole, test kit and start-up chemicals.

Do fibreglass pools have a liner?

No. The swimming surface of a fibreglass pool is the gelcoat layer of the shell itself, backed by a vinyl-ester barrier and structural laminate. There's nothing to replace every decade the way a vinyl liner needs, and no interior render to redo.