The 24-foot pool, and the yard that has to hold it

What changes at 24 feet

Our 18 foot guide describes the point where a pool becomes something a family swims in rather than sits in. Twenty-four feet is the next threshold, and what changes is not the swimming, it is everything around it.

An Intex Ultra XTR at this size holds a published 12,481 gallons. That is roughly two and a half times an 18 by 52 frame pool. Every consumable scales with it: the fill, the chemicals, the pump hours needed for turnover, and the cost of heating if you ever decide to. Our cost of going bigger guide makes the case that one size up is a subscription rather than a premium, and 24 feet is where that argument becomes concrete.

It also changes the equipment. A frame-pool cartridge pump cannot turn over 12,000 gallons in a sensible time, which is why every pool here ships with sand filtration or expects you to buy it. Our large-pool equipment guide covers what else stops working at this size.

The ground you actually need

Not 24 feet. Wilbar’s installation manual instructs builders to mark the circumference using a radius of half the pool size plus 12 inches, which for a 24 foot pool is a 13 foot radius and a 26 foot circle. In The Swim publishes the same rule of thumb: a 24 ft pool needs a 26 ft circle.

On top of that there is clearance, which is a safety requirement rather than a working one. Intex’s manual asks for five to six feet of space all around the pool, clear of objects a child could climb on to gain access. Bestway specifies at least four feet for climbable objects and a minimum of six feet from any electrical receptacle.

Level: the requirement nobody publishes a number for

Every manufacturer we checked asks for the ground to be level, and none of them publishes a tolerance. Wilbar is the most direct: “you must make the pool area absolutely level as measured by a level or transit, not simply by the naked eye”, adding that if it is done incorrectly the pool will break and the warranty will be voided.

Intex substitutes a practical test for a number: fill to an inch and see whether the water runs to one side, then drain and re-level if it does. Bestway is blunt about the method — the ground must be dug out where necessary, and sand must not be used to create a level base.

The widely quoted “level within one inch” figure does not appear in any manufacturer instruction we could fetch. Our leveling guide covers why the stakes rise with diameter: an out-of-level 24 foot pool carries far more water weight onto the low side than a 12 foot one does.

Frame pool or steel wall at this size

At 24 feet the two categories genuinely compete, which is not true at 12 or 15 feet.

The frame pool goes up in a day, costs far less, includes its filtration, and carries a two-year warranty. It is the right answer if you want a big pool this summer and are content to treat it as a five-to-seven year purchase.

The steel-wall pool takes a weekend or a contractor, costs several times as much once the missing parts are added, and is built to stay up for a decade or more with liner replacements along the way. Our permanent pools roundup covers that category properly, and our lifespan guide covers the arithmetic of buying twice versus buying once.

What tips it, more often than budget, is the ground. A 26 foot circle that has been properly leveled and based is a significant piece of work. Having done it, the argument for putting a pool on it that lasts fifteen years rather than five gets stronger.

What it costs to run

Start with water. At the EPA WaterSense average of $6.06 per 1,000 gallons, filling 12,481 gallons is about $76. That is a one-off for a permanent pool and an annual event for a take-down frame pool — which is a running-cost difference people rarely put in the comparison.

Chemicals scale the same way. A shock dose sized for 10,000 gallons does not treat this pool; you are buying at 1.25 times the rate all season, every season. Our chemical cost guide works that through, and our annual running cost guide puts the whole year together.

The one saving available at this size is the same as at every size, and it matters more here: a cover. Evaporation is proportional to surface area, and a 24 foot pool has nearly twice the surface of an 18 foot one. Our solar cover payback guide shows why it is the first accessory to buy rather than the last.

How we picked

We have not tested these pools. Scores are our reading of published specifications, and this category publishes unevenly: Intex publishes capacity, flow and warranty; two of the steel- wall kits publish no water capacity at all, and one does not publish its wall specification on the manufacturer’s own page. Where a figure is a seller’s estimate rather than a manufacturer specification, we have labeled it as one.

Delivery day, and the help you will need

A 24 foot pool arrives as several heavy packages rather than one, and a steel-wall kit arrives as a wall roll that two people cannot comfortably carry. Before ordering, work out where a pallet can be dropped and how it gets from there to the site.

Our delivery and check guide makes the case for opening every box before the weekend you plan to build, and it matters more at this size: a missing part on a frame pool is an afternoon lost, and a missing part on a steel-wall kit with a hired installer is a day.

Intex publishes a set-up time of 60 minutes to ready-for-water on its frame pools, and that figure excludes groundwork, which is the part that actually takes the weekend. A steel-wall kit publishes no set-up time at all, which is its own answer.

The equipment that has to grow with the pool

Three things change at 12,000 gallons, and all of them cost money if they are wrong.

Filtration. Size from system flow rather than pump flow. On Intex’s published 2,450 gph system figure, 12,481 gallons turns over in about 5.1 hours, which is comfortable. The same pool on a small cartridge pump does not, and our sand filter roundup covers what to buy instead.

Chemical quantities. Doses are per gallon, so a 24 foot pool uses roughly two and a half times the chemistry of an 18 by 52 frame pool. Buying in the sizes that suit 10,000 gallon pools stops being wasteful and starts being sensible.

Covers and their handling. A solar cover for a 24 foot pool is a large, heavy, awkward object when wet. This is the size at which a reel stops being a luxury, which our cover reel roundup covers, and the size at which a winter cover needs its overlap thought about properly.

Heating, and why most people should not

Heating cost scales with surface area and volume, and at 24 feet both are large. Our heating guide prices it properly from wattage and local rates, and the short version is that heating a pool this size by electricity is a serious running cost rather than a small upgrade.

The cheap intervention is the same one that saves water: a cover. Our solar cover payback guide shows why it is the first thing to buy at any size, and at 452 square feet of surface it is the difference between a pool that holds its warmth overnight and one that does not.

If you are set on heat, our heater sizing guide does the calculation, and the answer at this size is usually a bigger unit than people expect, which is the point at which the cover argument gets made again.

Winter at this size

The close is the same job as on a smaller pool with larger objects. The water comes down to the level your manufacturer specifies rather than being drained, the equipment comes out and goes indoors, and the cover goes on over an air pillow.

What changes is that a single air pillow in the middle of a 24 foot pool leaves a wide ring of water to freeze against the wall, which is why our air pillow roundup makes the case for two on pools this size. And a cover holding rainwater over 452 square feet is a great deal of weight, so a cover pump stops being optional.

For a take-down frame pool, the other end of that decision arrives in autumn: 12,481 gallons has to go somewhere, and our draining guide covers where it may legally go and how to get it there without flooding a neighbor.