Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
FC-2375 spa filter equivalents
Part number FC-2375 appears in 9 cross-reference rows below. Each row lists the OEM, Unicel and Pleatco numbers that the source documents treat as interchangeable, plus the cartridge size so you can confirm against your old filter.
The same numbers, on one page, are in the cross-reference lookup. A schedule for this part number, and the buy link, are on the replacement schedule and reorder page. Published intervals by brand are in the replace and clean calculator.
Hot Spring C-4326 cartridge (OEM 33521), 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326
Disclosure: we may earn a commission from qualifying purchases made through retailer links on this site, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Check price on Amazon opens the Unicel C-4326 listing we checked. These are affiliate links. Product photos are omitted unless Amazon supplied one through the Product Advertising API or a SiteStripe image link. Verify dimensions before ordering. See our affiliate disclosure.
| OEM | 33521 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Hot Spring section), PDF p.39 (printed p.35); spec table PDF p.9 (printed p.5) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Hot Springs, printed p.38 (PDF p.20) (PDF)
Not in sources: no model/model-year fitment in sources.
Full details → · All Hot Spring spa filters · Which fitting you need · How to install it
Hot Spot C-4326 cartridge (OEM 33521), 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 33521 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Hot Springs Spas section), PDF p.39 (printed p.35); spec table PDF p.9 (printed p.5) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Hot Springs, printed p.38 (PDF p.20) (PDF)
Not in sources: no model/model-year fitment in sources.
Full details → · All Hot Spot spa filters · Which fitting you need · How to install it
Jacuzzi C-4326 cartridge (OEM 373045), 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 373045 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Jacuzzi section), PDF p.42 (printed p.38); spec table PDF p.9 (printed p.5) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (PDF)
- Filbur Catalog & Reference Guide: Unicel-to-Filbur reverse cross reference, printed p.64 (PDF p.33) (PDF)
Not in sources: no model/model-year fitment in sources.
Full details → · All Jacuzzi spa filters · Which fitting you need · How to install it
Nordic Hot Tubs C-4326 cartridge, 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 31CARTRIDGE |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference (Nordic Hot Tubs section), PDF p.46 (printed p.42); spec table PDF p.9 (printed p.5) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (C-4326 = PRB25-IN) (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Nordic Hot Tubs, printed p.44 (PDF p.23) (PDF)
- Nordic Hot Tubs filter chart (2023): CARTRIDGE row: Unicel C-4326, Pleatco PRB25-IN, Filbur FC-2375, Waterway 817-2500; model list, before/after Sept 2021 notes (PDF)
- Nordic Hot Tubs 2022 service parts list: 31CARTRIDGE, Cartridge, Filter, 25 SQ FT (PDF)
Not in sources: Nordic's chart does not use the catalogs' 7/99 date and gives no years for most models; Nordic's owner's manual lists Impulse under CARTRIDGE-E while the chart lists it here.
Full details → · All Nordic Hot Tubs spa filters · Which fitting you need · How to install it
Arctic Spas C-4326 cartridge, 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: OEM cross reference: Arctic Spas entry (PDF p.28, printed p.24) points to Blue Falls Mfg. Ltd. (Canada), PDF p.29 (printed p.25); spec table PDF p.9 (printed p.5) (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (C-4326 = PRB25-IN) (PDF)
- Filbur Catalog & Reference Guide: Product by Pool/Spa Manufacturer (OEM), Arctic Spas, printed p.27 (PDF p.14) (PDF)
Not in sources: no OEM part number in sources; no model/model-year fitment in sources.
Full details → · All Arctic Spas spa filters · Which fitting you need · How to install it
Beachcomber C-4326 cartridge (SKU 3005845), 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 3005845 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Beachcomber Hot Tubs (manufacturer product page): SKU 3005845: 25 sq ft, 4-15/16" diameter, 2-1/8" core, 13-5/16" height, 107 pleats, 3 oz, 1995 to current (web page)
- Unicel 2026 Replacement Guide: Beachcomber OEM cross-reference, PDF p.29 (printed p.25): 3005845 = C-4326, 4-15/16" x 13-5/16", 25 sq ft, 3 oz; spec table PDF p.9 (printed p.5): 106 pleats, 2-1/8" open ends (PDF)
- Pleatco 2023 Catalog: Unicel-to-Pleatco cross reference, PDF p.47 (C-4326 = PRB25-IN); spec table PDF p.32 (5" OD) (PDF)
- Filbur Catalog & Reference Guide: Beachcomber Spas, PDF p.15: FC-2375 = C-4326, 4-15/16" x 13-5/16", 25 sq ft (PDF)
Not in sources: Pleat count 107 (Beachcomber) vs 106 (Unicel); Pleatco outside diameter 5" vs 4-15/16".
Full details → · All Beachcomber spa filters · Which fitting you need · How to install it
PDC Spas C-4326 cartridge (OEM FLT-201TL), 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | FLT-201TL |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- PDC Spas (manufacturer filter guide, 2025): Luxury, Premium, SE and LX, 1990–present: FLT-201TL, 25 sq ft, 5" × 13-5/16", 2-1/8" holes, Unicel C-4326 (PDF)
- Unicel 2026 Replacement Guide: PDC Spas block, PDF p.47 (printed p.43): C-4326, 4-15/16" × 13-5/16", 25 sq ft, 3 oz. Spec table PDF p.9 (printed p.5): 106 pleats, 2-1/8" open ends. C-4625 is the 4 oz cartridge of the same size. (PDF)
- Pleatco 2023 Catalog: Spec table PDF p.32: PRB25-IN, 5" × 13-5/16", 3 oz, 25 sq ft. Cross-reference PDF p.47: C-4326 = PRB25-IN. (PDF)
- Filbur Catalog & Reference Guide: Size table PDF p.9 (printed p.17): FC-2375 = C-4326. PDC section printed p.45: FC-2370 printed as C-4325. (PDF)
Not in sources: Diameter 5" (PDC, Pleatco) vs 4-15/16" (Unicel, Filbur). Filbur’s PDC section prints C-4325 on the FC-2370 row; its size table prints FC-2370 as C-4625 and FC-2375 as C-4326..
Full details → · All PDC Spas spa filters · Which fitting you need · How to install it
Coleman Spas C-4326 cartridge (OEM 100586), 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 100586 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: Coleman OEM block PDF p.32: 100586 and 3301-2242 = C-4326, 25 sq ft, 4-15/16" x 13-5/16" (PDF)
- Pleatco 2023 Catalog: Spec table PDF p.32: PRB25-IN lists OEM 100586, 5" x 13-5/16", open 2-1/8", 25 sq ft (PDF)
- Filbur Catalog & Reference Guide: Coleman Spas section PDF p.16: FC-2375, OEM 100586, PRB25-IN, C-4326, 25 sq ft (PDF)
Not in sources: Outside diameter 4-15/16" (Unicel and Filbur) versus 5" (Pleatco). No model name..
Full details → · All Coleman Spas spa filters · Which fitting you need · How to install it
Waterway Plastics C-4326 cartridge (OEM 817-2500), 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft. Unicel C-4326, Pleatco PRB25-IN.
Unicel C-4326 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
| OEM | 817-2500 |
|---|---|
| Unicel | C-4326 |
| Pleatco | PRB25-IN |
| Filbur | FC-2375 |
| Size | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft |
Sources
- Unicel 2026 Replacement Guide: Waterway list PDF p.64: 817-2500 = C-4326, 4-15/16" x 13-5/16", 25 sq ft. Spec table PDF p.9: open 2-1/8", 106 pleats. (PDF)
- Waterway Plastics Service Logic cartridge table: Fetched 2026-11-09: 817-2500, 25 sq ft, in-line top-load (web page)
- Pleatco 2023 Catalog: Spec table PDF p.32: PRB25-IN includes OEM 817-2500, 5" x 13-5/16", 25 sq ft (PDF)
- Filbur Catalog & Reference Guide: Waterway section PDF p.28: FC-2375 and FC-2910 both list OEM 817-2500. Size table lengths FC-2910 at 13-1/4". (PDF)
Not in sources: Outside diameter 4-15/16" vs Pleatco 5". Filbur FC-2910 length 13-1/4" in the size table and 12-1/4" in the Waterway section, against 13-5/16" on FC-2375, Unicel, and Pleatco..
Full details → · All Waterway Plastics spa filters · Which fitting you need · How to install it