Unicel 4CH-949AM Anti-Microbial Filter Cartridge - Arctic Spas 2009-2019 & 2020+ Classic, Core Series

Replacement Hot Tub Filter Cartridge

Reliable 50 sq. ft. replacement cartridge designed for many Arctic Spa models and compatible spa systems. This cartridge traps dirt, oils, and debris so your spa water stays clearer and your circulation equipment runs efficiently.

✅ Key Benefits

• High-efficiency 50 sq. ft. media for extended run times and fewer cleanings
• Anti-microbial media option helps resist bacterial growth between cleanings (anti-microbial version is identified by blue pleats)
• Standard 2" female thread for easy, tool-free replacement
• Compact dimensions fit a variety of Arctic Spa Classic and Core series tubs and other compatible brands

🔧 Specifications

• Outer Diameter: 4-15/16" (approx.)
• Length: 13-1/2" (overall)
• Connection: 2" FPT
• Filtration Area: 50 sq. ft.

📋 Compatibility

Designed to fit many Arctic Spa Classic and Core series models (2009 and newer), and is commonly used as a replacement in select Dynasty, Waterway and Rising Dragon spas. Always verify your spa’s cartridge length, outer diameter, and thread type before ordering.

🛠 Installation & Care

• Turn off power to the spa pump and remove the filter housing cap
• Unscrew and remove the old cartridge, inspect housing for debris
• Install the replacement cartridge by hand-threading the 2" FPT connection until snug — do not overtighten
• Rinse cartridge periodically with a hose and use a filter cleaner soak monthly or as needed for heavy use
• Replace the cartridge when pleats show damage, excessive staining, or when flow remains restricted after cleaning

♻️ Maintenance Tips

• Rinse weekly and deep-clean with an enzymatic or alkaline filter cleaner every 1–3 months depending on bather load
• Rotate replacement filters annually or sooner if flow and water clarity decline

ℹ️ Notes

• Measure your existing cartridge’s overall length, outer diameter, and thread size to confirm fit before purchase
• The anti-microbial version is visually identified by blue pleats; functionally it provides an added resistance to microbial growth but does not replace routine cleaning

If you need assistance confirming fit for your spa model, provide your spa model and current cartridge measurements and a knowledgeable parts specialist can help ensure compatibility.

Arctic Spa Filter, 2009+, 50 Sq.Ft

This filter fits the following Hot Tubs:

• Arctic Spa Classic Series
• Arctic Spa Core Series
• Dynasty Spas
• Waterway
• Rising Dragon

4-15/16"OD

13-1/2''L 2'' Fpt Anti-Microbial

Image Shows 4CH-949; 4CH-949AM has blue pleats.