How to Fill a Swim Spa: Gallons, Fill Time and Truck Delivery in South Jersey

Published November 13, 2026 · A Clear Alternative Water, Pennsauken NJ, since 1991

A swim spa holds far more water than a hot tub, usually somewhere between 1,500 and 5,000 gallons depending on its length and depth. At a typical garden hose rate, that can mean most of a day to fill. Swim spa makers generally recommend a full drain and refill every three to four months with regular use. Water delivery by truck turns that long fill into a short visit, which matters most for a brand-new swim spa, a winter refill that should not leave the shell empty overnight, or a home with a well that cannot keep up. A Clear Alternative delivers swim spa, hot tub and pool water across Burlington, Camden, Gloucester, Atlantic, Salem, Cape May, Mercer and Monmouth counties. Call 856-856-5210.

How Much Water a Swim Spa Holds

A swim spa sits between a hot tub and a pool. One swim spa maker puts the typical range at 1,500 to 4,000 gallons, and longer or deeper models can hold more. Your owner's manual or the spec sheet for your model lists the exact capacity. If you cannot find it, measure the inside length, width and average water depth in feet and multiply them together, then multiply by 7.5 to get gallons. Our guide to how many gallons your pool holds walks through the same math.

How Often to Drain and Refill

A major hot tub and swim spa maker recommends a full drain and refill every three to four months for typical home use. Over time, dissolved solids from chemicals, sweat, lotion and evaporation build up until the water gets hard to balance. That maker puts the turning point at a total dissolved solids reading of about 1,500 to 2,000 ppm.

Signs it is time even before the calendar says so:

• Cloudy or foamy water that will not clear after shocking
• Sanitizer that disappears much faster than usual
• A lingering chemical or stale smell
• pH or alkalinity that keeps drifting no matter what you add

Hose vs Truck: How Long a Fill Takes

A garden hose on household pressure often runs at something like 5 to 10 gallons a minute. At that rate, a 3,000-gallon swim spa takes roughly 5 to 10 hours to fill, and longer if your pressure is low. On a private well, running the hose that long works the pump hard and can stir up sediment. Our guide to filling a pool with well water explains why.

A water truck delivers the whole fill at once. That means the shell is empty for a much shorter time, the heater can start working the same day, and you are not standing in the yard all afternoon watching a hose. Before booking, check that a truck can get close enough for the hose to reach; see what the water truck needs to reach your pool.

Filling a New Swim Spa

A new swim spa is usually set by the dealer, and the electrician has to finish before it can be filled and powered up. Follow the dealer's start-up instructions first. Common first-fill steps:

1. Confirm the electrician has finished and the power is off at the breaker.
2. Check that all drain valves are closed and the filters are installed.
3. Fill through the filter compartment if your manual says to, which helps push air out of the plumbing.
4. Fill to the waterline the manufacturer specifies, then restore power.
5. Bleed any air from the pumps if the jets surge or the system shows a flow error.
6. Test and balance the water once it is circulating.

Schedule the delivery once you know the date the electrical work will be done, so the water is not sitting in a spa that cannot run.

Refill Steps After a Drain

The same maker suggests using a submersible pump to drain, which can empty a large swim spa in 30 to 60 minutes instead of hours by gravity. Then:

1. Turn off power at the breaker before draining.
2. Drain fully and wipe down the shell and waterline.
3. Clean the filters, which should be cleaned at every full drain.
4. Refill with the hose in the deepest end or filter compartment to reduce airlocks.
5. Fill to the waterline, restore power and close the cover.

Drained water should go where your town allows. Many towns ask you not to send it into storm drains.

Balancing the Water After a Fill

That maker's guide recommends testing and balancing new water within the first 24 hours, adjusting alkalinity first, then pH, then sanitizer. For sanitizer and pH targets, the CDC recommends free chlorine of at least 3 ppm or bromine of 4 to 8 ppm in home hot tubs, with pH between 7.0 and 7.8 and water no hotter than 104°F. Swim spas used for exercise are often kept cooler than that. Retest after a day of circulation and adjust in small steps.

Winter Timing in South Jersey

Many swim spas run year-round in South Jersey. If yours needs a winter refill, pick a day that stays above freezing. One major hot tub maker advises against draining in freezing weather and suggests a day above 40°F. Do the drain and refill in one stretch so the plumbing is never left empty overnight. Our guide on refilling a hot tub in winter covers the cold-weather steps, which apply to swim spas too. With the outside spigot shut off for the season, truck delivery also saves you from turning it back on.

Swim Spa vs Hot Tub: What Changes

Swim spa care looks a lot like hot tub care, just at a bigger scale. A few differences are worth knowing:

• Chemical doses are larger. Every dose is based on gallons, so a swim spa that holds ten times more water than a hot tub needs far more product. Always use the gallons for your model.
• Partial water changes help. Some owners drain and replace part of the water between full changes to keep dissolved solids down, which is easier with a big body of water.
• Dual-zone models need care on refill. If your swim spa has a separate hot tub section, fill and balance both sides, since they may have their own filters and heaters.
• The cover is heavy. A long swim spa cover often needs a lifter or two people. Keep it latched in winter wind.

If you are thinking about a fill for both a swim spa and a pool on the same property, mention both when you call so we can plan the delivery.

Serving Eight South Jersey Counties

We fill swim spas, hot tubs and pools in Burlington, Camden, Gloucester, Atlantic, Salem, Cape May, Mercer and Monmouth counties. See our hot tub and spa water page and check our service areas for your town.

When to Call A Clear Alternative

Call us when your new swim spa is set and wired, when the water is due for its three- or four-month change, or when you want a winter refill done in one short visit. Tell us the spa's capacity, where it sits and how close a truck can park. A Clear Alternative is a family-run company based at 9230 Collins Ave in Pennsauken, in business since 1991. Call 856-856-5210 any time, call the office at 856-663-8088, or request a quote online.

Frequently Asked Questions

How many gallons does a swim spa hold?

Most hold roughly 1,500 to 5,000 gallons, depending on length and depth. Check your owner's manual or measure length x width x average depth in feet and multiply by 7.5.

How long does it take to fill a swim spa with a hose?

At a typical 5 to 10 gallons a minute, a 3,000-gallon swim spa takes roughly 5 to 10 hours. A water truck can deliver the whole fill in one visit.

How often should I drain and refill my swim spa?

Swim spa makers generally recommend every three to four months for typical home use, or sooner if the water becomes hard to balance.

Can I refill a swim spa in winter?

Yes, on a day that stays above freezing, ideally 40°F or warmer. Drain and refill in one stretch so the plumbing is not left empty overnight.

Do you deliver heated water?

No. We deliver cold water, and your swim spa heater brings it up to temperature after the fill.