The large rectangular Intex Ultra XTR frame pools are the best pick for most people who actually want to swim, because a rectangle gives you real length instead of a curved wall you crash into. If you have a tighter yard or a smaller budget, a big round Ultra XTR still gives you plenty of water for floating and playing. Below are the picks, who each one fits, and where each one asks for compromise.
Use the calculator above to size this to your pool, since the kit is only part of the real cost once you add ground prep, a pad, and gear. You can also browse the full lineup on our above-ground pools page.
| Pick | Best for | Watch out for |
|---|---|---|
| Intex Ultra XTR Rectangular Pool (32 ft x 16 ft x 52 in) | Real lap swimming | Huge footprint, big water volume |
| Intex Ultra XTR Frame Pool (26 ft x 52 in) | Most swimmable round | Needs a large, level circle |
| Intex Ultra XTR Rectangular Pool (18 ft x 9 ft x 52 in) | Smaller yards | Length caps quick laps |
| Bestway Power Steel Oval Pool (16 ft x 10 ft x 42 in) | Odd-shaped yards | Shallower 42 in depth |
| Intex Prism Frame Pool (18 ft x 48 in) | Value round | Round shape limits swimming |
| Intex Ultra XTR Frame Pool (18 ft x 52 in) | Budget deep water | Round wall, not lap-friendly |
What size actually counts as "real swimming"?
Real swimming means you can push off and take several strokes before you touch the far wall. In an above-ground pool, that usually needs a length of 18 feet or more and a wall height (depth) around 48 to 52 inches. Depth matters because a 42 inch pool leaves a tall adult scraping the bottom on any real stroke.
Shape matters just as much as size. A round pool wastes swimming length on curves, so a 24 foot round often swims worse than an 18 foot rectangle. If laps are the goal, lean rectangular and accept the higher price and bigger footprint.
Best overall: Intex Ultra XTR Rectangular Pool (32 ft x 16 ft x 52 in)
Premium
This is the closest an above-ground pool gets to a real backyard swimming pool. At 32 feet long with a 52 inch wall, you get usable length and enough depth for adults, and the Ultra XTR frame uses reinforced supports meant to handle the water load of a pool this size. Owner reports generally praise the swim length, which is the whole point here.
The tradeoff is scale. This pool holds a large volume of water (check the listing for exact gallons), so it costs more to fill, heat, and chemically balance, and it demands a big, dead-level footprint. Ground prep is not optional at this size, and a torn floor from uneven ground is expensive to fix.
Best swimmable round: Intex Ultra XTR Frame Pool (26 ft x 52 in)
Premium
If your yard fits a circle better than a rectangle, the Intex Ultra XTR Frame Pool (26 ft x 52 in) is the roomiest round option here. At 26 feet across with a 52 inch wall, there is enough open water to swim short bursts and plenty of room for a crowd to float. The XTR frame is the sturdier Intex line, which matters as diameter and water weight climb.
The catch is that a round pool never swims like a rectangle, since you run out of straight line fast. You also need a large, truly level circle, and a pool this wide magnifies any slope. Great for family use, less ideal if you are chasing laps.
Best for smaller yards: Intex Ultra XTR Rectangular Pool (18 ft x 9 ft x 52 in)
Mid-range
When you want rectangular swimming but do not have room for a 32 footer, the Intex Ultra XTR Rectangular Pool (18 ft x 9 ft x 52 in) is the sensible middle. The 18 foot length still lets you take a few real strokes, the 52 inch depth suits adults, and the smaller footprint fits far more yards.
The tradeoff is obvious: 18 feet caps your lap length, so strong swimmers will touch the wall quickly. It is a strong choice for families who want a rectangle for kids and casual swimming without committing the whole backyard.
Best for odd-shaped yards: Bestway Power Steel Oval Pool (16 ft x 10 ft x 42 in)
An oval threads a useful line between round and rectangular, and the Bestway Power Steel Oval Pool (16 ft x 10 ft x 42 in) fits narrow or awkward spaces where a big circle will not. The Power Steel frame is Bestway's sturdier steel-frame line, and the oval shape gives you more straight-line water than a round of similar footprint.
The compromise is depth. At 42 inches, this pool is shallower than the 52 inch options, so tall swimmers will feel the bottom on real strokes. It is best for cooling off, kids, and light swimming rather than serious laps.
Best value round: Intex Prism Frame Pool (18 ft x 48 in)
Mid-range
For families who want a lot of water without the top-tier price, the Intex Prism Frame Pool (18 ft x 48 in) is a proven, simpler frame pool. At 18 feet across and 48 inches deep, it holds a serious amount of water for floating, playing, and easy cooling off, and the Prism line is a common, well-supported choice.
The tradeoff is that the Prism frame is lighter-duty than the XTR line, and the round shape limits swimming to short bursts. If your goal is a big, affordable backyard pool rather than a lap pool, the value here is strong.
Best budget deep water: Intex Ultra XTR Frame Pool (18 ft x 52 in)
Mid-range
If you want the deeper 52 inch wall without stepping up to the largest sizes, the Intex Ultra XTR Frame Pool (18 ft x 52 in) delivers full-depth water in a more manageable 18 foot round. The extra depth over a 48 inch pool makes a real difference for adults, and you still get the stronger XTR frame.
As with any round, you trade swimming length for a smaller, easier-to-place footprint. It is a good fit for owners who care more about deep, comfortable water than about doing laps.
What else you need to budget for
The pool kit is only the start. A large pool needs level ground, usually a ground cloth and a pad under the liner, a filter pump sized to the volume, and often a heater if you want a long season. Run the above-ground pool cost calculator so the ground prep and gear do not surprise you.
Keeping the water clean is its own job. Start with our pool chemistry basics guide to learn what to test and add, and if you go salt, read the saltwater pool maintenance walkthrough first. The same test-and-balance habits that keep a hot tub clear apply here, just at a bigger scale.
A word on safety before you fill it
A large above-ground pool is deep enough to be a real drowning risk, especially for young kids, so treat access seriously. The CPSC has a drowning prevention toolkit with layered protection steps, and Pool Safely covers barriers, supervision, and drain safety.
Practical steps: remove or lock the ladder when the pool is not in use, add a barrier or fence if local code requires it, and never leave kids unsupervised near the water. The bigger the pool, the more this matters.
Frequently asked questions
How big does an above-ground pool need to be for real swimming?
For actual laps or steady movement, most people want a length of at least 18 feet and a depth around 48 to 52 inches. Smaller round pools are fine for cooling off, but you will feel the walls fast once you try to swim. A rectangular shape helps because you get usable length instead of a curved edge.
Round or rectangular for a large above-ground pool?
Rectangular pools give you the most swimmable length for the footprint, which is why they cost more. Round and oval pools are usually cheaper per gallon and easier to fit in an odd yard. It depends on whether you care more about swimming laps or just floating and playing.
How much water does a large above-ground pool hold?
A big 24 or 26 foot round pool can hold well over 10,000 gallons, and large rectangulars run higher still. More water means more chemicals, a longer heat-up time, and a bigger filter job. Check the specific model listing, since gallons vary a lot by exact size and wall height.
Do these pools need special ground prep?
Yes. A large pool full of water is extremely heavy, so it needs level, compacted ground, usually within an inch across the whole footprint. Most owners add a ground cloth and sometimes a sand or foam pad under the liner. Skipping prep is the fastest way to a leaning wall or a torn floor.
Can I run a large above-ground pool as saltwater?
Many larger frame pools support a salt chlorine generator, and some kits include one. It softens the day-to-day feel and reduces chlorine handling, but it does not make the pool maintenance-free. See our saltwater maintenance guide, and confirm the model and cell are rated for your pool volume.
