How Many Gallons in a Swim Spa?

Swim spas are the perfect alternative for those who don’t have the space to install a full-sized swimming pool. Swim spas also allow you to swim outdoors all year round – something you won’t be doing in your typical backyard swimming pool. It’s the smaller size of the swim spa that allows it not only to fit into tight spaces but keep the water temperature high enough to prevent it from freezing in the winter months. So how much smaller are swim spas? If a full-sized swimming pool holds anywhere from 3000 to 30,000+ gallons, how many gallons in a swim spa? Swim spas also have a large range in sizes, albeit not quite as broad as swimming pools. To give you a better idea of what a swim spa holds, we present the following factors.

The Evolution of Swim Spas

In comparison to today’s swim spas, the earliest swim spas were quite compact. However, over time it was realized that too small a tank resulted in a less than satisfactory swim. A swim spa 10 feet in length tends to create too much turbulence which makes for a rough swim. It also makes it difficult for the swimmer to stay in the middle of the current. It’s also been noticed that swimmers over six feet in height have their swimming stroke hampered in such a small tank. For this reason, many of today’s swim spas are longer than 10 feet. For example, the smaller Hydropool models such as the AquaSport 14AX and AquaTrainer 14AX measure in at 14 feet and hold 1900 gallons each.

Dual Tank Swim Spas

Dual tank swim spas are popular among families and those who frequently enjoy hosting guests. As the name suggests, there are two tanks – one for swimming and the other for lounging. This allows the operator to maintain two different water temperatures – one appropriate for swimming and the other more akin to hot tubbing. Dual tank swim spas are some of the largest on the market and hold the most water. For example, the AquaTrainer 19 DTAX and the AquaSport 19 DTAX are each 19 feet in length and hold over 2000 gallons of water.

Why Is Knowing Swim Spa Volume Important?

Aside from general interest, knowing how much water your swim spa contains is important when it comes to balancing the water chemistry. The volume of water in the swim spa will be the basis for any calculations regarding the addition of chemicals. Whether balancing the pH or adding sanitizing shock, the size of your tank will play an essential role in your calculations. If you’ve forgotten how many gallons the swim spa holds and can’t find the owner’s manual, you can do a rough estimate. Measure the tank in inches and multiply the length by the width and depth by the constant 0.00434 to get the volume of the tank in gallons. If you need to convert this to liters, multiply the number of gallons by 4.546.

How Big A Swim Spa Do You Need?

The general rule of thumb when it comes to swim spa size is to get the largest your circumstances will allow. Whether you’re limited by budget or space, try and maximize what you’re working with. However, determining the right-sized swim spa for you also depends on who will be using it and how it will be used. A single competitive swimmer planning on using the swim spa solely for training purposes probably won’t require extra seating or a second tank. A large family or someone who enjoys entertaining guests is probably better off with a larger tank with extra seating or a dual tank swim spa. And if you’re taller than the average person and plan on doing a lot of swimming, you’ll probably want to get a longer tank.

To learn more about the various swim spa sizes, download a free buyer’s guide today.

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One thought on “How Many Gallons in a Swim Spa?

  1. How many gallons does a PDC swim spa 15’x7 1/2′ take? Need to know for chemicals.

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