Pleatco PRB50-IN = Unicel C-4950 = Filbur FC-2390
50 sq ft hot tub filter, 5" diameter × 13-5/16" long. Top: 2-1/8" open · Bottom: 2-1/8" open. Pleatco application: Dynamic Series IV - DFM, DFML, Series II & III RTL/RCF-50, Series I RDC-50, RDC-50S, Waterway, Custom Molded Products.
Interchangeable cartridges
- Unicel C-4950 confirmed by: Pleatco p.47 (Unicel to Pleatco cross reference) Unicel p.9 (Cartridges by series (dimensional listing))Unicel note: Note: 50 sq.ft. C-4950 is an upgrade to 25 sq.ft. C-4326 and C-4625 cartridges.
- Filbur FC-2390 confirmed by: Pleatco p.48 (Filbur to Pleatco cross reference) Filbur p.33 (Reverse cross reference (Unicel to Filbur)) Filbur p.9 (Dimensional cartridge listing)
Published dimensions, side by side
Each manufacturer measures a little differently. Compare these with your old cartridge.
| As published by | Pleatco PRB50-IN source | Unicel C-4950 source | Filbur FC-2390 source |
|---|---|---|---|
| Outside diameter | 5" | 4-15/16" | 4-15/16" |
| Length | 13-5/16" | 13-5/16" | 13-5/16" |
| Top end | 2-1/8" open | 2-1/8" / open | 2-1/8" open |
| Bottom end | 2-1/8" open | 2-1/8" / open | 2-1/8" open |
| Filter area | 50 sq ft | 50 sq ft | 50 sq ft |
| Pleats | not listed | 212 | not listed |
| Media weight | 3 oz/yd² | 3 oz/yd² | not listed |
Where to buy
Search any retailer for C-4950 or PRB50-IN or FC-2390. These are the same cartridge under different brand names.
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OEM part numbers this cartridge replaces
As printed in the cited aftermarket catalogs. Match the number on your old cartridge or in your spa manual exactly.
Hot tub brands that use it
From the spa-manufacturer cross reference in the Unicel 2026 Replacement Guide. A brand may use several sizes, so check your measurements.
- Aber Hot Tubs (Canada) (OEM 03FIL1600) Unicel p.26
- Accent Spas Unicel p.26
- Acryx-Maax Spas (Canada) Unicel p.26
- Alps Spas Unicel p.26
- American Spas Unicel p.27
- Apollo Spas Unicel p.27
- Aqua Mystic Unicel p.27
- Aqua Tech Spas Unicel p.27
- Aquiform-Infinity Spas Unicel p.28
- Arcadia Spas Unicel p.28
- Artesian Spas Unicel p.29
- Baja Spas Unicel p.29
- Beachcomber (OEM 3005815) Unicel p.29
- Belize Spas Unicel p.29
- Blue Falls Mfg. Ltd. (Canada) Unicel p.29
- Blue Pacific Spas Unicel p.30
- Bullfrog Spas Unicel p.30
- Cal Spas Unicel p.30
- Caldera Spas (OEM 302005, 73533, 76076) Unicel p.30
- Charisma Spas Unicel p.31
- Clipper Spas Unicel p.31
- Coast Mountain Spas (Canada) Unicel p.31
- Coast Spas (Canada) Unicel p.31
- Coleman Spas (OEM 100533, 3301-2145) Unicel p.32
- Columbia Spas Unicel p.32
- Crystal Waters Spas (Canada) Unicel p.32
- Custom Molded Products (models: Top Mount Skim, Top Load Pressure, EZ Twist Top Mount Skim; OEM 25391, 25393) Unicel p.33
- Diamond Back Spas Unicel p.33
- Discovery Spas Unicel p.34
- Dynasty Spas Unicel p.34
- Emerald Spas Unicel p.35
- Executive Unicel p.35
- Four Winds Spa Unicel p.35
- Gatsby Spas Unicel p.36
- Great Lakes Home & Resort Unicel p.36
- H2O Spas Unicel p.36
- Haughs Unicel p.37
- Haven Spas Unicel p.37
- Hawkeye Spas Unicel p.37
- Heldor Spas Unicel p.39
- Honey Tubs Unicel p.39
- Hydro Spa Unicel p.39
- Infinity Spas - TN Unicel p.40
- Islander Spas Unicel p.41
- J.E.M. Spas Unicel p.41
- Jacuzzi Premium (models: J200 Series; OEM 373045) Unicel p.42
- Leisure Bay Spas Unicel p.43
- Maax Spas of AZ (OEM 100533) Unicel p.44
- Marathon Spas Unicel p.44
- Midwest Spas Unicel p.45
- Millennium Spas Unicel p.45
- Moonwater Spas Unicel p.45
- Morgan Spas Unicel p.45
- Northwest Spas Unicel p.46
- Orca Bay Spas (OEM 5001) Unicel p.46
- Pageant Spas Unicel p.46
- Pentair Pool Prod (models: Dynamic Series IV - DFM,DFML, Dynamic Series II & III RTL/RCF-50, Dynamic Series I RDC-50, Dynamic Series I RDC-50S; OEM R173434) Unicel p.47
- Pentair Pool Prod - Rainbow Plastics (models: Dynamic Series IV - DFM,DFML, Dynamic Series II & III - RTL/RCF, Dynamic Series I - Model RDC; OEM 17-2380) Unicel p.52
- Phoenix Spas Unicel p.53
- QCA Unicel p.53
- Rising Dragon Unicel p.54
- River Valley Spas Unicel p.54
- Rubadub Tub Unicel p.54
- Safari Spas Unicel p.54
- Seahorse Spas Unicel p.55
- Sequoia Design Unicel p.55
- Sierra Spas Unicel p.55
- Signature Spas Unicel p.55
- Sonoma Spas Unicel p.56
- Southwest Spas Unicel p.56
- Spa Crest Unicel p.56
- Spas Direct Unicel p.56
- Streamline Spas Unicel p.58
- Strong Industries Unicel p.58
- Sun Coast Spas Unicel p.58
- Sun Ray Spas (Canada) Unicel p.58
- Sun West Spas Unicel p.58
- Sunbelt Spas Unicel p.58
- Suncountry Spas Unicel p.59
- Sundance Spas (OEM 6540-471) Unicel p.59
- Sunrise Spas Unicel p.59
- Sunset Spas Unicel p.59
- Superior Spas Unicel p.59
- Tiara Spas Unicel p.60
- Tuff Spas Unicel p.60
- US Spas Unicel p.62
- US Tooling & Spa Unicel p.62
- Vita Spas (OEM PRB 50IN) Unicel p.63
- Warm Springs Spa Unicel p.63
- Waterway Plastics (models: TWM Cartridge Filter Pack, Top load (in-line) 50 sq.ft.; OEM 817-5000) Unicel p.64
- Wind River Spas Unicel p.65
- Zone Spas Unicel p.65
FAQ
What is the Unicel equivalent of Pleatco PRB50-IN?
The catalogs cross-reference Pleatco PRB50-IN to Unicel C-4950.
What is the Filbur equivalent of Pleatco PRB50-IN?
The catalogs list Filbur FC-2390.
What size is the PRB50-IN filter?
Pleatco lists PRB50-IN as 5" outside diameter by 13-5/16" long, top: 2-1/8" open, bottom: 2-1/8" open, 50 sq ft.
Which OEM part numbers does it replace?
Listed OEM numbers: 03FIL1600, 17-2380, RTL-50, 100533, 6540-471, 25391, 817-5000, R173434, 3005815, 302005, 73533, 76076, 3301-2145, 25393, 373045, 5001.
Sources: Filbur Product Catalog and Reference Guide (2024) · Filbur Product Catalog and Reference Guide (2024) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Pleatco 2023 Catalog & Cross Reference Guide (Pentair) · Unicel 2026 Replacement Guide. Last checked 2026-10-21.