Pool Filter [Lifetime Warranty] FC-2402 303279 Hot Tub Spa Filter - Replaces 78460, PFF42TC-P4, ACT-50SQFLTR, AK4301, LSX1057, SD-01322 Lifesmart, Freeflow, AquaTerra, Hydromaster, Grandmaster, Simplicity, Watkins | Pack of 2
Two BlueStars 303279 hot tub spa replacement filters with 1-1/2 inch MPT threaded bottom and circular handle top.
FC-2402 hot tub spa filter dimension and specification diagram showing end caps, handle, and threaded bottom connection.
Comparison chart showing compatible 1-1/2 inch MPT fine thread vs incompatible 1-1/2 inch SAE coarse thread spa filters.
Infographic showing FC-2402 hot tub filter trilobal fabric material structure for enhanced filtration.
Infographic showing FC-2402 hot tub spa filter with high dirt holding capacity and debris filtration features.
FC-2402 hot tub spa filter replacement graphic showing compatibility with Lifesmart, Freeflow, and Aquaterra spas.
Informational graphic for FC-2402 hot tub spa filter maintenance and cleaning instructions.
BlueStars 303279 hot tub spa filter replacement infographic showing product benefits and features.
FC-2402 hot tub spa filter replacement shown with a family enjoying a swimming pool.
Two BlueStars 303279 hot tub spa replacement filters with 1-1/2 inch MPT threaded bottom and circular handle top.
FC-2402 hot tub spa filter dimension and specification diagram showing end caps, handle, and threaded bottom connection.
Comparison chart showing compatible 1-1/2 inch MPT fine thread vs incompatible 1-1/2 inch SAE coarse thread spa filters.
Infographic showing FC-2402 hot tub filter trilobal fabric material structure for enhanced filtration.
Infographic showing FC-2402 hot tub spa filter with high dirt holding capacity and debris filtration features.
FC-2402 hot tub spa filter replacement graphic showing compatibility with Lifesmart, Freeflow, and Aquaterra spas.
Informational graphic for FC-2402 hot tub spa filter maintenance and cleaning instructions.
BlueStars 303279 hot tub spa filter replacement infographic showing product benefits and features.
FC-2402 hot tub spa filter replacement shown with a family enjoying a swimming pool.
Lifetime Warranty

[Lifetime Warranty] FC-2402 303279 Hot Tub Spa Filter - Replaces 78460, PFF42TC-P4, ACT-50SQFLTR, AK4301, LSX1057, SD-01322 Lifesmart, Freeflow, AquaTerra, Hydromaster, Grandmaster, Simplicity, Watkins | Pack of 2

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FC-2402 / 303279 Pool & Spa Filter

Key Features

  • Length: 9 3/8 in.
  • Outer Diameter: 5 1/4 in.
  • Antimicrobial filter media inhibits odor-causing bacterial growth on pleats.
  • Durable end caps and a reinforced inner core for structural integrity and optimal water flow.
  • High-count pleat design for increased filtration capacity.

Replaces / Cross-Reference Part Numbers

  • FC-2402
  • 5CH-37
  • PFF42TC-P4
  • 303279
  • 78460
  • 50406
  • ACT-50SQFLTR
  • LSX1057

Compatibility & Fitment

  • Designed for spas manufactured by Watkins.
  • Fits specific models from brands including Aquaterra, Lifesmart, Fantasy, Freeflow, Simplicity, Bermuda, Aspire, and Azure.

When to Replace

  • When water flow is noticeably reduced or pump pressure increases.
  • If end caps are cracked or pleats are torn, collapsed, or permanently discolored.
  • When the filter remains dirty or causes cloudy water after a thorough cleaning.
  • Recommended replacement every 12-24 months, depending on bather load and usage.

Installation Tips

  • Turn off all power to the spa pump before beginning.
  • Unscrew the filter housing lid and remove the old filter cartridge.
  • Clean any debris from the filter housing and threads.
  • Install the new filter, hand-tightening until it is snug. Do not over-tighten.
  • Secure the housing lid, restore power, and prime the pump according to your spa's instructions.
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  • WIDE COMPATIBILITY

    WIDE COMPATIBILITY

    This part replaces 78460, Pleatco PFF42TC-P4, Filbur FC-2402, ACT-50SQFLTR, AK4301, LSX1057 and more.
  • UPGRADED MATERIAL

    UPGRADED MATERIAL

    Our product features trilobal fabric material which can capture dirt, sand, hair and other debris to maintain clean water.
  • BEST SOLUTION

    BEST SOLUTION

    Experience the wonderful feeling of swimming in a clean pool - BlueStars brings DIY solutions to help you deal with any trouble.
  • SIMPLE INSTALLATION

    SIMPLE INSTALLATION

    Have a clean pool in just 15 minutes of replacement!
Brand Model Number
1 Gauge the cartridge's external diameter, ensuring accuracy to within +/- 1/16 inch.
2 Measure the cartridge's length from one end cap to the other, excluding any protruding handles or extensions, to within +/- 1/16 inch.
3 Determine the top and bottom type. If they're open, measure the inner diameter of the opening to within +/- 1/16 inch. For closed end caps, jot down distinct features (e.g., "Handle", "Cone").
4 Note down the filter's manufacturer and model number where the new cartridge will be placed.
5 Check if there's a central core (like a PP pipe) present.

FAQ

This filter is commonly used in select spas from Lifesmart, Freeflow, AquaTerra, Hydromaster, Grandmaster, Simplicity, and Watkins when the original filter matches the listed part numbers and configuration. It is the style with a closed top and string handle, plus a 1-1/2 inch MPT threaded bottom. Always confirm your old filter number and end-cap style before ordering.
This filter cross-references to 303279, 78460, PFF42TC-P4, ACT-50SQFLTR, AK4301, LSX1057, and SD-01322. Additional cross-reference numbers found for this filter style include FC-2402, 5CH-37, and PC-2402. Matching the part number and the threaded-bottom/closed-top design is the best way to confirm fit.
Check the key features of your current cartridge: closed top with string handle, bottom with 1-1/2 inch MPT threading, and an overall size around 9-3/8 to 9-1/2 inches long and about 5-1/4 to 5-3/8 inches outside diameter. If your old filter matches those details and one of the listed part numbers, this is likely the correct replacement.
Typical symptoms include weak water flow, cloudy water, recurring filtration or circulation issues, a dirty cartridge that will not rinse clean, or a filter pleat pack that is flattened, torn, or heavily scaled. If your spa is taking longer to clear water or the pump seems strained, the filter is often one of the first items to inspect.
No. Replacing this type of spa filter is usually a simple maintenance task that takes about 5 to 10 minutes. Shut off power to the spa, open the filter compartment, unscrew the old cartridge from the threaded mount, and install the new one hand-tight. No special tools are normally required.
Before installing, verify the old part number, compare the top and bottom end styles, and inspect the filter housing threads for debris or damage. It is also a good time to check water chemistry, rinse out the filter well, and confirm there is no cracked standpipe or broken retaining hardware that could affect sealing or flow.
Early clogging is often caused by high bather load, body oils, lotions, scale from unbalanced water, or fine debris that gets trapped deep in the pleats. In hot tubs, poor sanitizer balance and calcium buildup can shorten filter life quickly. Regular rinsing and periodic deep-cleaning help, but once the media stays matted or restricted after cleaning, replacement is the better fix.