ATV & Marquis Swim Spa Replacement Filter – Replaces 20499

Replacement Filter for Marquis ATV and Compatible Swim Spas

Keep your swim spa’s water clean and circulating properly with this premium replacement filter for select Marquis Aquatic Training Vessel—or ATV—swim spas. Its tall, high-capacity design provides approximately 90 square feet of filtration media to help capture dirt, oils, debris and other contaminants from large volumes of swim-spa water.

This cartridge features antimicrobial-treated pleated media, a convenient removal handle and a threaded bottom connection designed to match compatible Marquis swim-spa filtration systems.

Replaces Marquis filter numbers 20499 and 20496. Also cross-references SC858-S and 50459M.

This listing includes one replacement filter. Certain Marquis swim spas use two filters, so verify the quantity required for your specific model before ordering.

🔹 Key Benefits

• Premium replacement filter for compatible Marquis and ATV swim spas
• Approximately 90 square feet of pleated filtration media
• Helps capture dirt, debris, oils and other water contaminants
• Antimicrobial-treated media helps inhibit microbial growth on the filter material
• Large-capacity design made for demanding swim-spa applications
• Closed top with a convenient integrated removal handle
• Threaded bottom connection for secure installation
• Washable and reusable with proper maintenance
• Replaces Marquis part numbers 20499 and 20496
• Cross-references SC858-S and 50459M

Important: Antimicrobial-treated filter media helps protect the filter material itself. It does not sanitize the swim-spa water or replace an approved chlorine, bromine or other water-care system.

🔍 Compatible Marquis Swim Spas

This replacement filter is designed for compatible filtration systems found in select Marquis swim spas, including:

• Marquis Aquatic Training Vessel—or ATV—14-foot models
• Marquis Aquatic Training Vessel—or ATV—17-foot models
• Select Marquis ATV swim spas originally using filter 20496
• Select Marquis ATV swim spas originally using filter 20499
• Select 2023 and newer Marquis V174S swim spas
• Select 2023 and newer Marquis V174K swim spas

Marquis has used different filtration systems across swim-spa models and production years. Do not order by brand or spa length alone. Confirm the part number, dimensions, threaded connection and required quantity before purchasing.

📏 Confirm Your Filter Before Ordering

Your current filter should match the following characteristics:

• Marquis filter number 20499 or earlier 20496
• Approximately 90 square feet of filtration media
• Approximately 30 inches of filter-body length
• Approximately 31½ inches in total length, including the handle and threaded fitting
• Approximately 5¼ to 5½ inches in outside diameter
• Closed top with an integrated removal handle
• Approximately 2-inch male threaded bottom connection
• Same overall end-cap and mounting configuration

Measurement note: Published measurements vary depending on whether the filter body or the complete cartridge—including the handle and threaded fitting—is measured.

If you are uncertain, contact Southern Leisure with pictures of the top and bottom of your existing filter, its measurements, the spa model and the spa’s production year before ordering.

📋 How to Replace

1. Turn off power to the swim spa at the breaker.
2. Remove the skimmer cover or filter-access assembly.
3. Use the integrated handle to carefully unscrew the existing cartridge.
4. Remove loose debris from the filter compartment.
5. Remove all protective packaging from the replacement filter.
6. Inspect the handle, end caps and threaded connection for damage.
7. Position the new cartridge over the matching filter-housing connection.
8. Thread the cartridge gently into place by hand.
9. Do not force, cross-thread or overtighten the filter.
10. Repeat the process if your swim spa uses a second cartridge.
11. Reinstall the skimmer cover or filter-access assembly.
12. Restore power and confirm normal water circulation.

💬 Southern Leisure Says

The 20499 is substantially longer than a typical hot-tub filter, so matching the complete cartridge is especially important. Confirm the handle, threaded bottom and overall dimensions before ordering—not just the outside diameter.

Many compatible Marquis swim spas use dual filtration. The V174S and V174K, for example, provide 180 square feet of total filtration using two 90-square-foot cartridges. This listing includes one filter, so check whether your swim spa requires two.

🧼 Care & Maintenance

• Inspect and rinse the filter regularly during normal swim-spa use.
• Rinse carefully between the pleats using a garden hose.
• Work from the top of the cartridge toward the bottom.
• Rotate the cartridge while rinsing to clean the entire filter.
• Clean more frequently during periods of heavy use.
• Periodically use a dedicated spa-cartridge cleaner to remove oils and residue.
• Follow the cleaner’s directions and rinse the cartridge thoroughly.
• Do not use a pressure washer, stiff brush or sharp cleaning tool.
• Maintain balanced water chemistry to support filter performance.
• Replace the cartridge if the pleats become torn, collapsed or permanently restricted.
• If the swim spa uses two filters, inspect and maintain both cartridges together.

📌 Product Quick Facts

• Product: Swim-spa replacement filter cartridge
• Compatible brand: Marquis
• Primary replacement number: 20499
• Also replaces: Marquis 20496
• Additional cross-references: SC858-S and 50459M
• Filtration area: Approximately 90 sq. ft.
• Filter-body length: Approximately 30 inches
• Overall length: Approximately 31½ inches
• Outside diameter: Approximately 5¼ to 5½ inches
• Top: Closed with integrated handle
• Bottom: Approximately 2-inch male thread
• Media: Antimicrobial-treated pleated filter media
• Package quantity: One filter
• OEM product: No—compatible replacement

⚙️ Specifications

Product Type	Swim-spa filter cartridge
Compatible Manufacturer	Marquis
Primary Replacement Number	20499
Previous Marquis Number	20496
Additional Cross-References	SC858-S and 50459M
Filtration Area	Approximately 90 sq. ft.
Filter-Body Length	Approximately 30 inches
Overall Length	Approximately 31½ inches, including fittings
Outside Diameter	Approximately 5¼ to 5½ inches
Top Configuration	Closed top with integrated handle
Bottom Connection	Approximately 2-inch male thread
Filter Media	Antimicrobial-treated pleated media
Package Quantity	One filter cartridge
OEM Product	No—compatible replacement

❓ Frequently Asked Questions

Is this a genuine Marquis OEM filter?

No. This is a compatible replacement designed to match the fit and filtration requirements of Marquis filter 20499. It is not manufactured or branded by Marquis.

Does this filter replace Marquis 20496?

Yes. The 20499 configuration superseded the earlier Marquis 20496 filter. Always compare the dimensions, handle and threaded connection before ordering.

Will this fit every Marquis swim spa?

No. Marquis has used multiple filter sizes and configurations. This cartridge is intended for select ATV models and compatible V174S and V174K swim spas. Verify your existing filter before ordering.

How many filters are included?

This listing includes one filter cartridge.

Does my swim spa need one or two filters?

Some compatible Marquis swim spas use two 90-square-foot filters. Current V174S and V174K models use dual filtration totaling 180 square feet. Inspect your swim spa or consult its owner’s manual to confirm the required quantity.

Why do different listings show slightly different measurements?

Some measurements include only the pleated filter body, while others include the handle and threaded fitting. The filter body is approximately 30 inches long, while the complete cartridge is approximately 31½ inches long.

What does antimicrobial-treated media do?

The treatment helps inhibit microbial growth on the filter material. It does not sanitize the swim-spa water or replace chlorine, bromine or another approved sanitizer.

Can this filter be cleaned and reused?

Yes. Carefully rinse between the pleats with a garden hose and periodically use a dedicated spa-cartridge cleaner. Thoroughly rinse away all cleaning solution before reinstalling the filter.

When should the filter be replaced?

Replace the filter when the pleats become torn, collapsed or permanently restricted, or when proper water flow cannot be restored through cleaning. Service life varies based on usage, water chemistry and maintenance.

🛡️ Why Buy From Southern Leisure?

• Compatibility assistance from experienced spa professionals
• Help confirming the correct filter before ordering
• Carefully selected replacement products
• Convenient shipping and local pickup options
• Trusted by spa owners since 2013

📦 Shipping & Pickup

• Ships as one swim-spa filter cartridge
• Shipping and pickup options are displayed at checkout
• This is an oversized filter; packaging dimensions may be larger than standard spa-filter shipments
• Inspect the cartridge, handle, pleats and threaded fitting upon arrival
• Keep the filter clean and protected until installation
• Confirm compatibility before installing or wetting the filter