PMA45-2004-R / C-8341 / FC-1007
40 sq ft replacement filter cartridge • 8″ OD × 7.375″ long
This is the outer half of the Master Spas EcoPur two-filter setup, a squat 40-square-foot cartridge that's 8 inches across and only 7-3/8 inches tall, with big 4-1/8-inch openings. It fits EcoPur tubs from 2004 to 2009, Down East models through 2010, and the Legend line up to 2013. Master Spas part numbers include X268330 and X268552, and the equivalents are Unicel C-8341 and Filbur FC-1007. The smaller PMA10 nests inside it, so if your tub runs the paired system, order both together. Master Spas revised this cartridge over the years, and the '2004-R' in the name matters, so confirm your tub's year to be sure you're getting the right revision.
Compare on Amazon
PMA45-2004-R 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 | PMA45-2004-R | Primary |
| Unicel | C-8341 | Equivalent |
| Filbur | FC-1007 | Equivalent |
| OEM | Master Spas X268330 | Original Equipment |
| OEM | Master Spas X268552 | Original Equipment |
| OEM | Down East 80402 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Hot Tubs & Spas
The PMA45-2004-R (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 |
|---|---|
| Master Spas | Twilight TS 7.2 |
| Master Spas | Twilight TS 8.2 |
| Master Spas | Legend |
| Master Spas | H2X Swim Spa |
Frequently Asked Questions
What are the dimensions of the PMA45-2004-R?
The PMA45-2004-R is 8 inches in outer diameter, 7.375 inches long, with an open top and an open bottom. Total filtration area is 40 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 PMA45-2004-R?
PMA45-2004-R is the same physical cartridge as C-8341, FC-1007, plus OEM versions like Master Spas X268330, Master Spas X268552, Down East 80402. Same dimensions (8" × 7.375"), 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 Master Spas X268330 the same filter as the PMA45-2004-R?
Yes. Master Spas X268330 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 Master Spas X268330 (along with Master Spas X268552, Down East 80402) and PMA45-2004-R, C-8341, FC-1007 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 PMA45-2004-R?
Mid-size spa cartridges like the PMA45-2004-R (40 sq ft) usually last 12 to 24 months. It shows up most often in Master Spas tubs. The real driver is use: a tub that gets daily soaks for a couple of people burns through cartridges about twice as fast as one used a few times a month. A good rhythm is a monthly hose rinse, a deep soak in cleaner at every water change (every three to four months), and replacement once the pleats tear, the seams stain brown, or a soak no longer brings post-clean pressure back to baseline.
How do I clean the PMA45-2004-R?
The PMA45-2004-R 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 PMA45-2004-R?
The PMA45-2004-R is compatible with: Master Spas Twilight TS 7.2, Master Spas Twilight TS 8.2, Master Spas Legend, Master Spas H2X Swim Spa. 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″ |
|---|---|
| Length | 7.375″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 40 sq ft |
| Primary Brand | Pleatco |
| Part Number | PMA45-2004-R |
Fitment notes
4-1/8 inch open top and bottom. Master Spas EcoPur outer filter 2004-2009. Down East 2004-2010. Legend 2004-2013.