Pleatco PLBS75 = Unicel C-5374 = Filbur FC-2971
75 sq ft hot tub filter, 5-5/16" diameter × 14-3/4" long. Top: 2-1/8" open · Bottom: 2-1/8" open. Pleatco application: Rainbow, Waterway, Leisure Bay, S2/G2 Spa 75.
Interchangeable cartridges
- Unicel C-5374 confirmed by: Pleatco p.47 (Unicel to Pleatco cross reference) Unicel p.11 (Cartridges by series (dimensional listing))
- Filbur FC-2971 confirmed by: Pleatco p.48 (Filbur to Pleatco cross reference) Filbur p.33 (Reverse cross reference (Unicel to Filbur)) Filbur p.10 (Dimensional cartridge listing)
Check before you order
- Unicel C-5374 rates it 65 sq ft (vs 75 sq ft); filter area ratings differ by maker.
- Filbur FC-2971 rates it 65 sq ft (vs 75 sq ft); filter area ratings differ by maker.
Published dimensions, side by side
Each manufacturer measures a little differently. Compare these with your old cartridge.
| As published by | Pleatco PLBS75 source | Unicel C-5374 source | Filbur FC-2971 source |
|---|---|---|---|
| Outside diameter | 5-5/16" | 5-5/16" | 5-5/16" |
| Length | 14-3/4" | 14-13/16" | 14-11/16" |
| 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 | 75 sq ft | 65 sq ft | 65 sq ft |
| Pleats | not listed | 223 | not listed |
| Media weight | 3 oz/yd² | 3 oz/yd² | not listed |
Where to buy
Search any retailer for C-5374 or PLBS75 or FC-2971. 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.
- Cal Spas Unicel p.30
- Clearwater Spas Unicel p.31
- Leisure Bay Spas (models: S2/G2 Spa) Unicel p.43
- Maax Spas of AZ (OEM 107092) Unicel p.44
- Rec Warehouse (OEM 303433) Unicel p.54
- Waterway Plastics (models: 75 sq.ft. top load; OEM 817-0015) Unicel p.64
FAQ
What is the Unicel equivalent of Pleatco PLBS75?
The catalogs cross-reference Pleatco PLBS75 to Unicel C-5374.
What is the Filbur equivalent of Pleatco PLBS75?
The catalogs list Filbur FC-2971.
What size is the PLBS75 filter?
Pleatco lists PLBS75 as 5-5/16" outside diameter by 14-3/4" long, top: 2-1/8" open, bottom: 2-1/8" open, 75 sq ft.
Which OEM part numbers does it replace?
Listed OEM numbers: 817-0015, 303433, R173600, 107092.
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.