The Four Types of Above Ground Pools: Which is Right for You?

There's no better way to spend a summer than in your own backyard pool. But before you start comparing models and sizes, there's one decision underneath all the others: what your pool is made of.

Above ground pools come in four main constructions — steel, resin, hybrid and aluminum. They look broadly similar in a photo. They behave quite differently over ten or fifteen years, and they cost different amounts both up front and in the long run.

Here's what actually separates them.

First, a distinction that matters

When people say a pool is "steel" or "resin," they can mean two different things, and conflating them causes a lot of confusion when you're shopping.

The wall is the sheet that holds the water. On the overwhelming majority of above ground pools sold today, this is metal — steel or aluminum — regardless of what the rest of the pool is made of.

The frame is everything else: top rails, top caps, uprights, connector plates and stabilizer bars. This is the part that varies most between models, and it's usually what a manufacturer is describing when they call a pool "resin."

So a "resin pool" very often means a pool with a resin frame and a steel wall. A true all-resin pool, with a resin wall too, is a different and less common product. When you're comparing models, ask which parts are which. It's the single most useful question you can ask a salesperson.

STEEL

Steel pools are the most popular above ground pools on the market and have been since the 1940s. They're the most cost-effective option and offer excellent structural strength.

During manufacturing, the wall is hot-dip galvanized — coated in zinc — and deeply corrugated for rigidity. The galvanizing is what stands between the steel and the weather, and it's designed to corrode preferentially so the steel underneath doesn't. Better models add multi-layer protective coatings on top of that. The frames on our steel kits use 6-inch steel top rails, 5-inch steel uprights and interlocking stabilizer rails.

Strengths: lowest cost for the strength you get, excellent rigidity, widest selection of sizes and shapes, and the most readily available replacement parts.

The trade-off: steel rusts if its coating is compromised and it stays wet. That's not a reason to avoid steel — it's a reason to install it on well-drained ground, keep organic material off the base of the wall, and look at it twice a year. Our steel wall rust guide covers exactly how.

Salt: this is the important one. Salt water is far more electrically conductive than fresh water, which accelerates corrosion on every metal component in the pool — the wall, the fasteners, the frame and the fittings. Steel is the construction least suited to it. If a salt system is a must-have for you, read our full guide to salt on steel wall pools before you buy either one.

RESIN

Resin pools cost more than steel. In most cases the frame — top rails, uprights, caps and connectors — is made entirely from plastic resin, while the wall remains metal.

Resin brings genuine advantages. It stays cooler to the touch on hot days, which you notice every time you grab a top rail in July. It can't rust or corrode at all, it resists denting and warping, and because resin can be molded rather than rolled, manufacturers can produce more modern, sculpted designs.

Strengths: no corrosion on frame components, cooler surfaces, better looks, and much better salt tolerance.

The trade-off: higher up-front cost, and resin components do degrade under years of UV exposure — quality varies significantly between manufacturers, so this is a place where brand matters.

HYBRID

Hybrid pools combine the two: the structural strength of steel with resin components in the places where corrosion does the most damage. A typical hybrid uses resin top rails and caps — the parts most exposed to sun and water — over a steel wall and steel or partially steel uprights.

The price point usually falls between steel and resin, and for a lot of buyers this is the sensible middle. You're spending your extra money specifically on the parts that fail first, which is a reasonable way to allocate a budget.

ALUMINUM

Aluminum pools have become more popular over the past decade. The wall is formed from aluminum rather than steel.

Aluminum is more flexible than steel and handles the movement of water well. It's naturally rust-resistant and, like steel, is usually coated to slow oxidation, so it holds up in harsh weather. It's also lighter, which matters on install day.

Strengths: won't rust, flexible, durable in bad weather, lighter to handle.

The trade-off: aluminum is not corrosion-proof — it pits rather than rusting, showing small white marks instead of orange, and it's vulnerable to galvanic corrosion where it contacts dissimilar metals at fittings and fasteners. It's also typically more expensive than steel and less common, which can make parts harder to source years down the line.

Side by side

What each one costs you over fifteen years

Up-front price is the number everyone compares. It's also the smaller half of the story, because the four constructions don't cost the same to own.

Three things stay roughly the same no matter what you buy. Your liner is a five-to-ten-year replacement regardless of construction. Your pump and filter last what they last. Your chemicals cost what they cost. So the long-run difference between these four options comes down to two variables.

How long the wall lasts. This is the pool's real lifespan, because the wall is the one component that isn't practical to replace on its own. On a steel pool, that number is decided almost entirely by moisture and coating integrity — which is to say, by drainage, site prep and whether anyone inspects it. On a resin or aluminum pool, corrosion is less of the equation. Our lifespan guide covers what the realistic ranges are.

How many frame parts you buy along the way. Steel frames eventually need parts. The stabilizer bars and connector plates under the top rails sit where water collects and don't dry quickly, so they're often the first steel to go — see our guide to replacing top rails, uprights and stabilizer bars. Resin frame components can't corrode at all, though they do eventually go brittle under years of UV.

Put together, the pattern looks like this. Steel asks less of your wallet on day one and more of your attention every year after. Resin asks more up front and less of you later. Hybrid splits the difference by spending the extra money specifically on the components that fail first.

Neither approach is wrong. What matters is being honest with yourself about which one you'll actually keep up with. A steel pool owned by someone who puts down a gravel border and looks under the top rails twice a year will outlast a resin pool sitting in a wet, unlevel spot — every time.

So which should you buy?

Buy steel if you want the most pool for your money, you have or can create a well-drained site, and you're willing to do a ten-minute wall inspection twice a year. This is the right answer for most families, and it's why steel has been the category's backbone for eighty years.

Buy resin if salt water is a priority for you, you're in a humid or coastal climate, you want the most modern-looking pool, or you simply want the lowest-maintenance long-term option and can fund it up front.

Buy hybrid if you want to spend a moderate premium precisely where it does the most good, or you're in a climate that's hard on top rails.

Buy aluminum if you have specific reasons to want a non-ferrous wall and you've confirmed parts availability for the model.

Regardless of what you buy, the site matters more than the material. A resin pool on a badly drained, poorly leveled base will underperform a steel pool installed properly. Our site leveling guide and our yard sizing guide are worth reading before you order anything.

Two more decisions while you're here

Round or oval. Round is stronger by geometry, needs a simpler support system, and costs less for the same swim area. Choose oval when the shape of your yard requires it.

Wall height. 52-inch walls give noticeably more depth than 48-inch for a small price difference. See what's the right pool wall height for me.

For the full budget picture including base material, water and electrical, see our cost guide.

The short version

• "Steel" and "resin" usually describe the frame, not the wall. Most walls are metal either way. Ask which is which.
• Steel is the best value and the strongest for the money, with corrosion as its one real weakness.
• Resin frames can't corrode, stay cooler, and tolerate salt — at a higher price.
• Hybrid puts resin where corrosion does the most damage, at a middle price.
• Aluminum won't rust but can pit, and parts are harder to find.
• Steel costs less up front and asks more attention over time; resin is the reverse. Hybrid splits it.
• A well-installed steel pool beats a badly installed resin one. Site prep matters more than material.