Which filter does my Coleman spa take?
Unicel does not name a Coleman model. It names the part number, and it says the 3301-xxxx format was used through 2001 and the 100xxx format since 2002. Three lengths come in a pair that is the same body with a different bottom thread. The 7" × 8" pair is 100432 / 3301-1018 (1-1/2" MPT, 7CH-32) or 100520 / 3301-2109 (2" MPT, 7CH-322). The 7" × 9-3/4" pair is 100433 / 3301-1019 (7CH-40) or 100521 / 3301-2110 (7CH-402). The 7" × 14-3/4" pair is 100434 / 3301-1020 (7CH-50) or 100522 / 3301-2111 (7CH-502). Measuring the cartridge body does not tell those pairs apart. The thread does. The short 2" cartridge is also the one the catalogs do not agree on: Unicel’s spec table and Filbur print 32 sq ft at 7" × 8", and Pleatco prints 35 sq ft at 7-1/8" × 7-9/16" for the same OEM numbers.
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The cartridges, with equivalents
| Factory part | What it is | Catalog equivalents | Rated area | Our page |
|---|---|---|---|---|
| FIL11100303 | 25 sq ft top-load. Unicel’s Coleman note: the original is 4-3/4" OD. No 3301 twin on this row. The same OEM is also on Unicel’s Cal Spas line. | Unicel 4CH-252. Pleatco cross-reference: PMA20-F2M. Not in Filbur’s Coleman section. | Unicel spec: 4-5/8" × 8", cone handle, 2" MPT, 213 pleats, 25 sq ft | 4CH-252, 4CH-252 |
| 100432 (3301-1018 through 2001) | 32 sq ft, 1-1/2" MPT. The short half of the first thread pair. | Unicel 7CH-32. Filbur FC-0425. Filbur’s Pleatco cell: PCS32P, which Pleatco’s deactivated list does not keep. | 7" × 8", handle, 175 pleats, 32 sq ft in Unicel’s spec and in Filbur’s Coleman section | 7CH-32 |
| 100520 (3301-2109 through 2001) | The 2" MPT twin of 100432. This is the cartridge Pleatco sizes differently. | Unicel 7CH-322. Pleatco PAS35-F2M. Filbur FC-0420 (Pleatco cell PAS35-2). | Unicel and Filbur: 7" × 8", 32 sq ft. Pleatco: 7-1/8" × 7-9/16", 35 sq ft. Unicel’s Artesian line also prints 35 sq ft for 7CH-322. | 7CH-322, 7CH-322 |
| 100433 (3301-1019 through 2001) | 40 sq ft, 1-1/2" MPT. Unicel’s spec line also names Vita Spas. | Unicel 7CH-40. Filbur FC-0435. Filbur’s Pleatco cell: PCS40P. | 7" × 9-3/4", 178 pleats, 40 sq ft | 7CH-40 |
| 100521 (3301-2110 through 2001) | 40 sq ft, 2" MPT. Same body as 100433. | Unicel 7CH-402. Filbur FC-0430. Filbur’s Pleatco cell: PCS40-F2M, which Pleatco deactivates with replacement N/A. | 7" × 9-3/4", 178 pleats, 40 sq ft | 7CH-402 |
| 100434 (3301-1020 through 2001) | 50 sq ft, 1-1/2" MPT. Unicel’s spec line also names Vita Spas. | Unicel 7CH-50. Filbur FC-0463. Filbur’s Pleatco cell: PVT50P. | 7" × 14-3/4", 144 pleats, 50 sq ft | 7CH-50 |
| 100522 (3301-2111 through 2001) | 50 sq ft, 2" MPT. Same body as 100434. | Unicel 7CH-502. Filbur FC-0460. Filbur’s Pleatco cell: PCS50-F2M, deactivated by Pleatco with replacement N/A. | 7" × 14-3/4", 144 pleats, 50 sq ft | 7CH-502 |
| 100586 (3301-2242 through 2001) | 25 sq ft open cartridge. Pleatco lists 100586 on PRB25-IN with several other brands’ numbers. | Unicel C-4326. Pleatco PRB25-IN. Filbur FC-2375. | 4-15/16" × 13-5/16", open 2-1/8", 25 sq ft | C-4326 |
| 100585 (3301-2241 through 2001) | 40 sq ft open cartridge. Filbur calls the row Waterway 40. | Unicel C-4339. Filbur FC-2915. Filbur’s Pleatco cell PWW40 is on Pleatco’s deactivated list as N/A. | 4-15/16" × 11-1/4", open 2-1/8", 216 pleats, 40 sq ft | C-4339 |
| 100533 (3301-2145 through 2001) | 50 sq ft open cartridge. The same OEM is on Unicel’s Maax Spas of AZ list, with no model name there either. | Unicel C-4950. Pleatco PRB50-IN. Filbur FC-2390. | 4-15/16" × 13-5/16", open 2-1/8", 50 sq ft | C-4950, C-4950 |
| 100593 (3301-2261 through 2001) | 50 sq ft, 2" male slip. Unicel’s note under the row: model dated after 1992. Maax lists the same OEM. | Unicel C-8450. Pleatco PCS50N. Filbur FC-3310. | 8" × 9". Opening 2-1/16" (Unicel, Filbur) or 2-1/8" (Pleatco). 50 sq ft. | C-8450, C-8450 |
| 100594 (3301-2262 through 2001) | 75 sq ft, 2" male slip. Same after-1992 note. Maax lists the same OEM. | Unicel C-8475. Pleatco PCS75N. Filbur FC-3320. | 8" × 13". Opening 2-1/16" (Unicel, Filbur) or 2-1/8" (Pleatco). 75 sq ft. | C-8475, C-8475 |
The 3301 number and the 100xxx number on one row are both printed by Unicel for that cartridge. Filbur’s Coleman section prints the 100xxx number and not the 3301 number. Pleatco’s own spec table prints a Coleman OEM only for 100520 / 3301-2109, 100586, 100533, 100593 / 3301-2261 and 100594 / 3301-2262. The other Pleatco strings in this table are the ones Filbur prints, and Pleatco’s 2023 deactivated list sends them to N/A. They are not stored as live Pleatco equivalents on the cartridge pages.
The three thread pairs
Unicel’s Coleman block opens with one note and no model names: “3301-xxxx part number format used thru 2001; 100xxx part number used since 2002.” Each of the next six rows prints both numbers. Filbur’s Coleman Spas section prints the 100xxx number, the Unicel number and a Pleatco cell, and it does not print the 3301 number.
| Length | 1-1/2" MPT | 2" MPT | What agrees |
|---|---|---|---|
| 7" × 8", 175 pleats | 100432 / 3301-1018 = 7CH-32. Filbur FC-0425, cell PCS32P. | 100520 / 3301-2109 = 7CH-322. Filbur FC-0420, cell PAS35-2. Pleatco’s own number is PAS35-F2M. | Unicel spec and Filbur’s Coleman section: 32 sq ft. Pleatco’s spec for 100520 and 3301-2109: 7-1/8" × 7-9/16", 35 sq ft. Unicel’s Artesian line also prints 7CH-322 at 35 sq ft, and adds “Original is 7-7/8" OD and 7-5/8" overall length.” |
| 7" × 9-3/4", 178 pleats | 100433 / 3301-1019 = 7CH-40. Filbur FC-0435, cell PCS40P. Spec line also names Vita. | 100521 / 3301-2110 = 7CH-402. Filbur FC-0430, cell PCS40-F2M. | 40 sq ft in Unicel and in Filbur. Pleatco’s 2023 cross-reference has no 7CH-40 or 7CH-402 line. PCS40-F2M is on the deactivated list with replacement N/A. |
| 7" × 14-3/4", 144 pleats | 100434 / 3301-1020 = 7CH-50. Filbur FC-0463, cell PVT50P. Spec line also names Vita. | 100522 / 3301-2111 = 7CH-502. Filbur FC-0460, cell PCS50-F2M. | 50 sq ft in Unicel and in Filbur. Pleatco’s cross-reference has no 7CH-50 or 7CH-502 line. PVT50P4 and PCS50-F2M are deactivated with replacement N/A. |
A 1-1/2" MPT bottom and a 2" MPT bottom do not interchange. Open-end versus threaded is the fitting check, and the measuring order is in how to find your spa filter size. Unicel’s discontinued-cartridge notes use the same split elsewhere: C-7432 is replaced by 7CH-32 if the pad adapter is 1-1/2" MPT and by 7CH-322 if it is 2" MPT, and the adapter has to come out of the skim well. That note is about the old open cartridge, not a Coleman model.
Filbur is not perfectly consistent about 7CH-32. The Coleman section and the dimensional listing print FC-0425 at 32 sq ft. A Water’s Edge Spas row prints the same FC-0425 / PCS32P / 7CH-32 at 35 sq ft. Coleman’s own row is the 32.
Pleatco’s deactivated list sends “PCS32-2 (W/ 2")” to PAS35-F2M. That is the old name with a 2" adapter, not a second live cartridge. Filbur still prints PAS35-2 in the cell for FC-0420. The live Pleatco number for 100520 is PAS35-F2M.
Open cartridges, and the slip pair dated after 1992
Under the threaded pairs, Unicel prints four open or slip cartridges. None of them has a model name. Two of the OEM numbers, 100533 and 100593 / 100594, are repeated on the Maax Spas of AZ list. Unicel’s Maax heading says “see also Coleman Spas.”
| OEM | Unicel | Filbur | Pleatco |
|---|---|---|---|
| 100586 / 3301-2242 | C-4326, 25 sq ft, 4-15/16" × 13-5/16" | FC-2375, PRB25-IN, 25 sq ft | PRB25-IN spec lists OEM 100586 among other brands, 5" × 13-5/16", open 2-1/8", 25 sq ft |
| 100585 / 3301-2241 | C-4339, 40 sq ft, 4-15/16" × 11-1/4", 216 pleats, open 2-1/8" | FC-2915, OEM 100585, cell PWW40, described as Waterway 40 | PWW40 is deactivated with replacement N/A. No Coleman OEM on a live Pleatco row. |
| 100533 / 3301-2145 | C-4950, 50 sq ft, 4-15/16" × 13-5/16" | FC-2390, OEM 100533, cell printed PRB50-IN | PRB50-IN spec lists OEM 100533, 5" × 13-5/16", open 2-1/8", 50 sq ft |
| 100593 / 3301-2261, after 1992 | C-8450, 8" × 9", 2-1/16" open, 2" male slip, 193 pleats, 50 sq ft | FC-3310, 2-1/16" open, male slip, PCS50N, 50 sq ft, “Model dated after 1992.” | PCS50N, 8" × 9", 2-1/8" open, 2" slip, 50 sq ft, OEM 100593 and 3301-2261 |
| 100594 / 3301-2262, after 1992 | C-8475, 8" × 13", 2-1/16" open, 2" male slip, 197 pleats, 75 sq ft | FC-3320, OEM 100594, PCS75N, 75 sq ft, same after-1992 note | PCS75N, 8" × 13", 2-1/8" open, 2" slip, 75 sq ft, OEM 100594 and 3301-2262 |
100586 and 100533 are the familiar 25 sq ft and 50 sq ft open bodies. Same length, two areas: that is the pleat-count split in why same-size filters have different square-foot ratings. Pleatco prints both at 5" OD. Unicel and Filbur print 4-15/16". The slip pair is a different fitting. A 2" male slip is not a 2" MPT and not an open 2-1/8" end.
FIL11100303 sits above the pairs, on 4CH-252. Unicel’s Coleman note says the original cartridge is 4-3/4" OD. The spec table prints 4-5/8". The same OEM is on the Cal Spas line. Filbur’s Coleman section does not list it. Pleatco’s cross-reference sends 4CH-252 to PMA20-F2M and does not print FIL11100303 on that spec line.
Where the sources disagree
- No Coleman model names. Unicel’s Coleman block is part numbers, a year-format note, and one “model dated after 1992” note on the slip cartridges. Filbur’s Coleman section is the same kind of list.
- 100520 / 7CH-322 area and length. Unicel spec and Filbur: 7" × 8", 32 sq ft. Pleatco PAS35-F2M: 7-1/8" × 7-9/16", 35 sq ft, for OEM 100520 and 3301-2109. Unicel’s Artesian line: 35 sq ft, and an original size of 7-7/8" × 7-5/8".
- Pleatco’s name for that cartridge. Pleatco’s cross-reference and spec table: PAS35-F2M. Filbur’s cell: PAS35-2. Pleatco’s deactivated list sends the 2" PCS32-2 to PAS35-F2M.
- 7CH-32 at 35 sq ft. That figure is on Filbur’s Water’s Edge row, not on the Coleman row. Coleman and the size table say 32.
- The other five threaded Pleatco cells. PCS32P, PCS40P, PCS40-F2M, PVT50P and PCS50-F2M are Filbur’s cells. Pleatco’s 2023 Unicel cross-reference does not list 7CH-32, 7CH-40, 7CH-402, 7CH-50 or 7CH-502. PCS40-F2M, PCS50-F2M and PVT50P4 are deactivated with replacement N/A.
- Slip opening. Unicel and Filbur 2-1/16". Pleatco PCS50N and PCS75N 2-1/8".
- Open-cartridge OD. Unicel and Filbur 4-15/16" for C-4326 and C-4950. Pleatco 5".
- 3301 numbers. Unicel prints them. Filbur’s Coleman section does not.
How to confirm yours
- Read the number on the old cartridge. A 3301-xxxx number is the through-2001 format. A 100xxx number is the later format. Unicel pairs them; it does not say a 2002 spa can only use the new number.
- If the body is 7" across, the length picks the pair (8", 9-3/4" or 14-3/4") and the thread picks the half. Do not order the other thread because the square feet match.
- If the number is 100520 or 3301-2109, read both sizes: 7" × 8" at 32 sq ft, and 7-1/8" × 7-9/16" at 35 sq ft. Hold the new cartridge against the old one.
- If the bottom is a slip fitting rather than a thread, you are on 100593 or 100594, and only if the spa is in the “after 1992” note Unicel prints under those rows.
- A Maax model name (Elegant, Intrigue, Joli, Elite) is a different list: Maax Spas of AZ.
Why one cartridge size can carry two different square-foot ratings: our explainer with Unicel’s pleat-count table.
Sources
- Unicel 2026 Replacement Guide, Coleman Spas OEM block, PDF p.32 (printed p.28): the 3301-xxxx / 100xxx note, FIL11100303, the six threaded pairs, 100586, 100585, 100533, and the after-1992 slip rows 100593 and 100594
- Unicel 2026 Replacement Guide, spec table: 7CH-32 and 7CH-322, PDF p.14 (printed p.10), both 7" × 8", 175 pleats, 32 sq ft; 7CH-40 and 7CH-402 on the same page, 178 pleats, 40 sq ft; 7CH-50 and 7CH-502, PDF p.15 (printed p.11), 144 pleats, 50 sq ft; C-8450 and C-8475, PDF p.20 (printed p.16)
- Unicel 2026 Replacement Guide, Artesian Spas block, PDF p.29 (printed p.25): 7CH-322 printed at 35 sq ft, with the note that the original is 7-7/8" OD and 7-5/8" overall length
- Filbur Catalog, Product by Pool/Spa Manufacturer, Coleman Spas, PDF pp.16–17: FC-2915 / 100585, FC-2375 / 100586, FC-2390 / 100533, FC-0420 / 100520, FC-0425 / 100432, FC-0435 / 100433, FC-0430 / 100521, FC-0463 / 100434, FC-0460 / 100522, FC-3310 / 100593, FC-3320 / 100594. The 3301 numbers are not in this section.
- Filbur Catalog, dimensional listing, PDF p.11: FC-0420 and FC-0425 at 32 sq ft. A Water’s Edge Spas row prints the same FC-0425 / 7CH-32 / PCS32P at 35 sq ft.
- Pleatco 2023 Catalog, spec table PDF p.34: PAS35-F2M, 7-1/8" × 7-9/16", 2" MPT, 35 sq ft, Artesian Top Load Spa (Coleman), OEM 100520 and 3301-2109. PDF p.35: PCS50N and PCS75N with OEM 100593 / 3301-2261 and 100594 / 3301-2262. PDF p.32: PRB25-IN lists OEM 100586; PRB50-IN lists OEM 100533.
- Pleatco 2023 Catalog, Unicel cross-reference PDF p.47: 7CH-322 = PAS35-F2M and 4CH-252 = PMA20-F2M. No line for 7CH-32, 7CH-40, 7CH-402, 7CH-50 or 7CH-502. Deactivated list PDF pp.22–25: PCS40-F2M, PCS50-F2M, PVT50P4 and PWW40 go to N/A; PCS32-2 (W/ 2") goes to PAS35-F2M.
This page summarizes published catalogs and dealer fitment tables; always follow your own spa’s owner’s manual. See our disclaimer and methodology.