Finding the right hot tub filter is essential for maintaining crystal-clear water and ensuring your spa runs smoothly. There are numerous hot tub filters available; choosing the best hot tub replacement filters can be overwhelming. We’ve researched and tested the top filters to help you find the most reliable options for different hot tub, jaccuzi, & spa models, ensuring long-lasting performance and easy maintenance.
Best Overall:
Unicel C-4950 50 Square Foot Hot Tub Filter – Amazon, $32.47
Best Budget Option:
SUNSET FILTERS Type VI Spa and Hot Tub Filter Replacement (6-Pack) – Amazon, $17.19
Best for Inflatable Hot Tubs:
Type VI Hot Tub Filter Cartridge, Coleman SaluSpa 90352E, 58323E, 58323 (16-Pack) – Amazon, $38.99
Best for Saltwater Systems:
Mamokin 303279 Hot Tub Filter (2-Pack) – Amazon, $42.99
Best for Large Hot Tubs:
Cryspool 04072 Hot Tub Filter Compatible with C-4326 – Amazon, $29.44
Best for Easy Maintenance:
DAYEAR Hot Tub Filter Cartridge Compatible with 6CH-940, PWW50P3 (2-Pack) – Amazon, $37.99
Best Hot Tub Filters of 2025
1. Unicel C-4950 50 Square Foot Media Replacement Pool Hot Tub Spa Filter Cartridge
What We Like:
✔ High-quality spun-bonded polyester for superior filtration
✔ 50 square feet of filtration area for extended performance
✔ Compatible with multiple spa brands like Jacuzzi, Sundance, and Cal Spas
✔ Durable end caps resistant to chlorine and chemicals
✔ Removes impurities as small as 20 microns
What We Don’t Like:
✘ Pricier than generic alternatives
✘ May require frequent cleaning in high-use spas
The Unicel C-4950 is a premium replacement filter cartridge that delivers exceptional filtration efficiency for spas and hot tubs. Its 212 pleats maximize debris capture while maintaining optimal water flow, making it a reliable choice for spa owners who want to keep their water pristine. This filter is compatible with a wide range of spa brands, ensuring a perfect fit for many hot tub models. While it may cost more than some generic filters, the high-quality polyester media extends its lifespan, making it a worthwhile investment.
Dimensions: 13.31”H x 4.93”D | Filtration Area: 50 sq ft | Material: Spun-bonded polyester
2. Type VI Hot Tub Filter Cartridge – Compatible with Lay-Z-Spa, Coleman SaluSpa
What We Like:
✔ Designed for inflatable hot tubs like SaluSpa and Bestway spas
✔ High-density trilobal fabric for better filtration and durability
✔ Comes in a value pack of 16 filters for long-term use
✔ Easy to clean and maintain
What We Don’t Like:
✘ Not suitable for high-capacity hot tubs
✘ Requires frequent replacement (every 2-3 weeks)
The Type VI Hot Tub Filter Cartridge is an excellent choice for inflatable hot tubs like Lay-Z-Spa and Coleman SaluSpa. It’s constructed from trilobal fiber material, which provides 3X better filtration compared to regular fabric filters. The value pack ensures you have replacements on hand, but due to its smaller size, it requires more frequent cleaning and replacements.
Dimensions: 3.1”H x 4.2”D | Filtration Area: Varies | Material: Trilobal polyester
3. DAYEAR Hot Tub Filter Cartridge Compatible with 6CH-940, PWW50P3 (2-Pack)
What We Like:
✔ Compatible with multiple spa brands, including Unicel 6CH-940, Pleatco PWW50P3, and Filbur FC-0359
✔ Made of heavy-duty trilobal polyester for enhanced filtration and durability
✔ Short-thread design ensures a secure fit and easy installation
✔ Large filtration area (45 sq. ft.) captures fine debris effectively
What We Don’t Like:
✘ Requires regular cleaning every 1-2 weeks for optimal performance
✘ Not compatible with PWW50-P4 models—size verification needed before purchase
The DAYEAR Hot Tub Filter Cartridge is a high-performance and cost-effective solution designed for users looking to maintain crystal-clear spa water. With trilobal filtration technology, this filter captures dirt, oils, and fine particles more efficiently than traditional filters, ensuring better water clarity and flow.
One of its standout features is its short-thread design, which allows for quick and stable installation, reducing the risk of leaks or misalignment. The durable polyester material resists high temperatures and chemicals, prolonging the filter’s lifespan compared to cheaper alternatives.
During our testing, the DAYEAR filter maintained consistent water flow and showed minimal clogging even with frequent hot tub use. If properly maintained with regular rinsing, it can last over a year, making it a great investment for spa owners.
Dimensions: 8.3”H x 6”D | Filtration Area: 45 sq. ft. | Material: Trilobal Polyester
4. Mamokin 303279 Hot Tub Filter – Compatible with AquaTerra, Freeflow, Simplicity
What We Like:
✔ High-flow core design for maximum water circulation
✔ Compatible with multiple Freeflow, AquaTerra, and Watkins spas
✔ Durable string handle for easy removal and installation
✔ Lasts up to one year with proper cleaning
What We Don’t Like:
✘ Only available in two-pack sets
✘ May not fit certain spa models—check dimensions carefully
The Mamokin 303279 is a high-performance 40 sq ft spa filter designed for premium hot tubs like AquaTerra and Freeflow. It features an advanced pleated fabric that captures fine debris while maintaining strong water flow. This filter is best suited for those seeking a long-lasting solution for their spa maintenance.
Dimensions: 9.37”H x 5.2”D | Filtration Area: 40 sq ft | Material: Reinforced polyester
5. Sunset Filters Type VI Replacement for Coleman SaluSpa, Lay-Z-Spa, Bestway, Intex
What We Like:
✔ Affordable and easy-to-replace design
✔ Designed for inflatable hot tubs and smaller spas
✔ Premium Dacron fabric for better filtration efficiency
✔ Available in 6-pack sets for convenience
What We Don’t Like:
✘ Shorter lifespan—needs frequent replacements
✘ Not compatible with built-in hot tub filtration systems
For owners of inflatable spas, the Sunset Filters Type VI is a great cost-effective solution. Its premium Dacron fabric traps dirt and debris efficiently while ensuring easy cleaning. However, since it’s designed for smaller spas, expect to replace these filters every 2-3 weeks.
Dimensions: 3.1”H x 4.2”D | Filtration Area: Varies | Material: Dacron fiber
6. Cryspool® 04072 Hot Tub Filter – Reliable & Long-Lasting Filtration
What We Like:
✔ Compatible with multiple spa brands (Hot Spot, Nordic, Beachcomber, and more)
✔ Trilobal fiber structure for superior dirt-trapping efficiency
✔ Reinforced end caps for added durability
✔ Easy-to-clean pleats that extend the filter’s lifespan
What We Don’t Like:
✘ May not fit non-standard hot tub models—double-check compatibility
✘ Slightly more expensive than some alternatives
If you’re looking for a high-quality replacement filter that lasts longer and keeps your hot tub crystal clear, the Cryspool® 04072 filter is an excellent choice. Built with trilobal fibers, this 25 sq. ft. spa filter ensures maximum debris capture while maintaining strong water flow. It’s engineered with reinforced end caps, which prevent cracking or wear over time—ideal for frequent spa users.
One of the standout features is the easy-to-clean pleats, allowing users to wash and reuse the filter multiple times without losing efficiency. While it’s compatible with a wide range of hot tub brands, it’s always recommended to verify dimensions before purchasing.
For those who want a durable, high-performance hot tub filter with extended longevity, the Cryspool® 04072 is a solid investment.
Dimensions: 13 5/16”H x 5”D | Filtration Area: 25 sq. ft. | Material: Trilobal Fibers
The Bottom Line
We tested and reviewed the best hot tub filters based on filtration efficiency, durability, compatibility, and ease of cleaning. Whether you need a replacement for your existing system or an upgrade for better water quality, these top-rated filters will help you enjoy a cleaner and healthier spa experience.
Our Testing Process
At WavesGadget, we conduct in-depth product testing by evaluating each filter’s ability to trap dirt, bacteria, and other impurities. We also assess longevity, ease of maintenance, and how well the filters maintain water clarity over time.
What to Know About Hot Tub Filters Before Shopping
Before purchasing a hot tub filter, consider these key factors:
- Filter Compatibility – Ensure the filter fits your specific hot tub model.
- Filtration Efficiency – Look for high-quality pleats and materials that effectively capture dirt and debris.
- Ease of Cleaning – Some filters are reusable, while others require frequent replacement.
- Durability – Opt for filters made from high-density polyester for longer lifespan.
- Brand Reliability – Trusted brands offer better quality and consistent performance.
Additionally, maintaining your hot tub water quality is just as important as choosing the right filter. To keep your spa water clean and balanced, consider using the best hot tub chemical kit for effective water treatment and longevity of your spa equipment.
FAQs
How often should I clean my hot tub filter?
It’s recommended to rinse your filter every 1-2 weeks and deep clean it monthly. Replace it every 6-12 months depending on usage.
Can I reuse my hot tub filter?
Yes, most filters are reusable with proper cleaning. However, once they show signs of wear or reduced water flow, they should be replaced.
What happens if I don’t replace my hot tub filter?
A clogged or old filter can reduce water circulation, cause cloudy water, and strain your hot tub’s pump.
Who We Are
WavesGadget is committed to providing expert-backed, research-driven product recommendations. Our team rigorously tests products to ensure reliability and value.
We conduct rigorous hands-on testing, considering real-world usability, durability, and filtration performance. Our recommendations are based on expert insights and customer feedback, ensuring only the best hot tub filters make the list.
