PSD85-2002 / C-8380 / FC-2810
85 sq ft replacement filter cartridge • 8.375″ OD × 14″ long
This is the main (outer) filter for Sundance's 780-series tubs, the Marin, Hamilton, Bristol, and Lucia. It covers the 850 systems from 2002 to 2004, the 2005 850 and 850E, and the 2006-onward 780 setup. It's an 85-square-foot cartridge, 8-3/8 inches across and 14 inches long. Sundance's own number is 6540-501, and the cross-references are Unicel C-8380 and Filbur FC-2810. Sundance filtration often pairs a main cartridge with a smaller pre-filter, so check whether your tub has a second, smaller element that also needs replacing. And note that the newer 880 and 980 tubs use an entirely different two-part MicroClean assembly. This cartridge is specific to the 780 and 850 systems.
Compare on Amazon
PSD85-2002 replacements on Amazon
The buttons below pull up Amazon results for each cross-reference part number. Same physical cartridge, different stickers, often different prices. Cross-shop and pick the cheapest option that has solid recent reviews.
Cross-Reference & Interchangeable Part Numbers
| Brand | Part Number | Type |
|---|---|---|
| Pleatco | PSD85-2002 | Primary |
| Unicel | C-8380 | Equivalent |
| Filbur | FC-2810 | Equivalent |
| OEM | Sundance 6540-501 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Hot Tubs & Spas
The PSD85-2002 (or any of its cross-references) fits these spa models. Cartridge sizing occasionally shifted between model years, so it's worth confirming against your owner's manual or the cartridge label.
| Brand | Model |
|---|---|
| Sundance | Marin 780 |
| Sundance | Hamilton 780 |
| Sundance | Bristol 780 |
| Sundance | Lucia 780 |
Frequently Asked Questions
What are the dimensions of the PSD85-2002?
The PSD85-2002 is 8.375 inches in outer diameter, 14 inches long, with an open top and an open bottom. Total filtration area is 85 square feet. Before ordering, pull your existing cartridge and measure it yourself, or check the label inside the housing. OD and length both have to match within about an eighth of an inch, and the end-cap style needs to match exactly so the cartridge seats properly when the lid closes.
What other part numbers are interchangeable with the PSD85-2002?
PSD85-2002 is the same physical cartridge as C-8380, FC-2810, plus OEM versions like Sundance 6540-501. Same dimensions (8.375" × 14"), same open top, same open bottom. The Pleatco, Unicel, and Filbur boxes ship the same media inside, just with different stickers. The only thing to watch is the end-cap style: if a cross-reference has a slightly different cap design, it may not seat right in your housing.
Is the Sundance 6540-501 the same filter as the PSD85-2002?
Yes. Sundance 6540-501 is an OEM number, the code the tub or pool builder stamps on the cartridge they ship. The filter itself is made by Pleatco, Unicel, or Filbur, so Sundance 6540-501 and PSD85-2002, C-8380, FC-2810 all point to one interchangeable cartridge. Buy whichever is cheapest with solid recent reviews, and just check that the dimensions match your old cartridge before you order.
How often should I replace the PSD85-2002?
85 sq ft is a lot of media for a hot tub, so the PSD85-2002 tends to outlast the small-format spa cartridges. It shows up most often in Sundance tubs. Two adults soaking a couple times a week can usually get 18 to 24 months out of one. Monthly hose rinses and a quarterly overnight soak stretch that further. Replace it when the pleats won't rinse clean or pressure starts climbing in a way soaking can't fix.
How do I clean the PSD85-2002?
The PSD85-2002 has open ends on both top and bottom, so water flows straight through. Pull the cartridge from the housing and hose it down. Hit the pleats from above at about a 45-degree angle so water rinses debris out instead of packing it deeper, and work top to bottom while rotating the cartridge. Skip the pressure washer. The high pressure tears or collapses pleats, and once that happens you've lost media that doesn't come back. Every few months (or at every water change, whichever comes first), do a deep clean: overnight soak in a hot tub filter cleaner, then a thorough rinse. If your cartridge has a closed end cap, let it dry before reinstalling so you don't trap moisture inside the cartridge core.
Which hot tubs and spas use the PSD85-2002?
The PSD85-2002 is compatible with: Sundance Marin 780, Sundance Hamilton 780, Sundance Bristol 780, Sundance Lucia 780. Confirm against your owner's manual or the label inside the filter compartment, since some brands changed cartridge sizing between model years.
Dimensions
Specifications
| Outer Diameter | 8.375″ |
|---|---|
| Length | 14″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 85 sq ft |
| Primary Brand | Pleatco |
| Part Number | PSD85-2002 |
Fitment notes
Sundance 780 series outer/main filter. 2002-2004 850 systems, 2005 850/850E, 2006+ 780 system.