Stop Guessing, Start Swimming: The Exact Above Ground Pool Supplies You Need by Pool Size and Shape

Setting up an above ground pool is one of the most rewarding backyard upgrades you can make — but walking into the supplies aisle without a plan is a fast track to buying the wrong products, overspending, or ending up with green water by week two. The truth is, the supplies you need depend heavily on the size and shape of your pool. This guide breaks it all down so you can shop with confidence and spend more time swimming.

First, Know Your Pool: Size and Shape Matter More Than You Think

Most above ground pools are manufactured in two shapes — round and oval. When it comes to shapes, you have two primary options: round and oval. Round pools are versatile, offering a balance between space and purpose — they provide ample room for swimming, relaxation, and activities without feeling cramped. Oval pools, on the other hand, are an excellent choice if you’re interested in activities like lap swimming or pool volleyball, though they do require more space.

Round pools range in size from 12 feet to 33 feet in diameter, increasing in size by 3-foot increments. Oval pools range in size from 8’x12′ to 21’x43′, with popular sizes including 12’x24′, 15’x24′, 15’x30′, 18’x33′, and 18’x40′. The 24-foot round pool is the most popular choice among pool enthusiasts, while for oval pools, the 15×30-foot option takes the lead — these sizes strike a great balance between space and usability.

Small families or couples with 1–3 people may find a smaller round pool (12–18 feet in diameter) sufficient, while larger families or those who frequently host guests should consider round pools 24 feet or larger, or oval pools for extra space.

The Non-Negotiable Supplies Every Above Ground Pool Needs

Regardless of size or shape, every above ground pool requires a core set of supplies to function safely and stay clean. In addition to your pool kit and liner, you’ll need a skimmer system, a pump and filter system to circulate your water and keep it clear, and a sanitizer to kill bacteria — most commonly chlorine.

• Pump & Filter System: Pump and filter systems keep your pool clean and help maintain water quality for safer swimming. Sand, cartridge, and DE filters each offer distinct advantages — and the right one depends on your pool’s volume and your maintenance preferences.
• Pool Liner: Vinyl is the most common liner material — it’s affordable and relatively durable. Liners typically need replacement every 5–10 years depending on quality and chemical balance.
• Ladder or Step System: A pool ladder not only helps people get in and out of the pool easily, but it also reduces stress and strain on the walls and sides of the pool that would otherwise be used for leverage.
• Water Testing Kit: You’ll also want some type of testing kit or strips to check your water’s balance.
• Cleaning Tools: To keep your pool clean, you’ll want to look at vacuums, cleaners, and skimmer leaf nets.

Matching Your Filter Size to Your Pool

One of the most common and costly mistakes above ground pool owners make is buying the wrong size filter. Above ground pools can range in size from under 3,000 gallons to over 20,000 gallons, so there are a wide variety of filter sizes to match any size above ground pool.

The right filter depends on your pool’s size and pump flow rate. As a general rule: small pools (up to 10,000 gallons) need a 50–75 sq ft cartridge or 16″ sand filter; medium pools (10,000–15,000 gallons) need a 75–100 sq ft cartridge or 19″ sand filter; and large pools (15,000+ gallons) need a 100+ sq ft cartridge or 22″+ sand filter.

Sand filters are popular due to their ease of maintenance and effectiveness for most home pools, while cartridge filters are suitable for smaller pools or pools with lower swimmer loads due to their finer filtration capabilities. For the cleanest water possible, DE filters provide the highest level of filtration — down to 3–5 microns — using a fine powder made from fossilized plankton to trap even the smallest particles.

Supplies by Pool Shape: Round vs. Oval Considerations

Round Pools: If you have the space and are looking for value, a round pool is the way to go. Because round pools do not require extra support the way an oval pool does, there are fewer components, they are less expensive to manufacture, and they are also easier and less expensive to install. For a standard round pool, your supplies list is straightforward: a correctly sized pump and filter combo, a round liner, a ladder, a winter cover, and your chemical starter kit.

Oval Pools: Oval pools require more support on the sides to hold the water in. For a round pool, the water evenly distributes, but oval pools come with a buttress system to hold the pool water on the sides. This means oval pool owners should budget for additional structural support components, a shape-specific liner, and potentially a slightly more powerful pump to handle the increased water volume.

Don’t Forget Seasonal and Safety Supplies

A complete above ground pool setup goes beyond just equipment. Proper winterizing is essential — this includes draining the pool partially, removing the pump and filter, and using winterizing chemicals. A quality winter cover sized to your pool’s exact dimensions is a must-have to protect your investment during the off-season.

For ongoing maintenance, robotic pool cleaners have become increasingly popular. Robotic cleaners run independent of your pool’s pump and filter, collecting debris in a self-contained fine mesh bag — and they are the most efficient out of all pool cleaners because they do not clean the same area twice.

Where to Find the Right Products for Your Pool

The founders of Backyard Supplies bring over 20 years of combined experience in the pool, spa, and outdoor living industry. They know which products hold up, which brands actually stand behind their warranties, and where homeowners usually get burned — and that knowledge goes into every product they carry and every conversation they have.

Backyard Supplies covers the whole pool and spa category: above-ground pools, pool robots from Polaris and Aiper, chemicals, filters, heaters, liners, water features, deck-mounted pool slides from Global Pool Products, and winter covers. Headquartered at 456 East Jericho Turnpike, Huntington Station, New York, they ship nationwide from their Long Island location. Their team operates on a simple but powerful principle: “we only carry products we’d install in our own backyards, and we only make claims we can back up.”

Whether you’re outfitting a compact 15-foot round pool for the kids or a sprawling 18’x33′ oval for the whole neighborhood, shopping for pool supplies for above ground pools from a knowledgeable, experience-backed retailer makes all the difference. Get the right products from the start, and your pool will reward you with a full season — and many seasons after — of crystal-clear, worry-free water.