ATV & Marquis Swim Spa Replacement Filter – Replaces 20499

OEM Replacement Filter for Marquis ATV and Compatible Swim Spas

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

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

This filter replaces Marquis part numbers 20499 and 20496. 

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

🔹 Key Benefits

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

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.

🧩 Compatibility & Fitment

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

• Marquis ATV 14 Sport
• Marquis ATV 14 Slash
• Marquis ATV 17 Sport
• Marquis ATV 17 Kona
• Select Marquis 14-foot ATV swim spas
• Select Marquis 17-foot ATV swim spas
• Select 2023 and newer Marquis V174S swim spas
• Select 2023 and newer Marquis V174K swim spas
• Select Marquis swim spas originally using filter 20496
• Select Marquis swim spas originally using filter 20499

Marquis has used different filtration systems across its swim-spa models and production years. Do not order based only on the brand or length of the swim spa. Confirm the existing filter 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 number 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
• Matching end-cap and mounting configuration

Published measurements may vary depending on whether the pleated filter body or the complete cartridge—including its handle and threaded fitting—is measured.

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

📋 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 its outside diameter.

Many compatible Marquis swim spas use dual filtration. Select V174S and V174K models, for example, provide approximately 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-filter 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 its pleats become torn, collapsed or permanently restricted.
• If your swim spa uses two filters, inspect and maintain both cartridges together.

⚡ Product Quick Facts

⚙️ Specifications

❓ 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 replaced 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 cartridges. 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.

Does this filter qualify for free shipping?

No. Because of its unusually long shipping dimensions, this oversized filter is excluded from free-shipping and free-freight promotions. The applicable shipping charge is calculated at checkout.

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-filter cleaner. Thoroughly rinse away all cleaning solution before reinstalling it.

When should the filter be replaced?

Replace the filter when its 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

• This oversized filter is excluded from free-shipping and free-freight promotions.
• The applicable shipping charge is calculated and displayed at checkout.
• This listing includes one swim-spa filter cartridge.
• Packaging dimensions will be larger than those of a standard spa filter.
• Inspect the cartridge, handle, pleats and threaded fitting promptly after delivery.
• Keep the filter clean and protected until installation.
• Confirm compatibility before installing or wetting the filter.
• Local pickup options are displayed at checkout when available.