Pleatco PWW50L = Unicel 4CH-949 = Filbur FC-0172
50 sq ft hot tub filter, 5" diameter × 13-3/16" long. Top: Handle · Bottom: 1-1/2" FEMALE SAE. Pleatco application: Waterway Teleweir 50.
Interchangeable cartridges
- Unicel 4CH-949 confirmed by: Pleatco p.47 (Unicel to Pleatco cross reference) Unicel p.9 (Cartridges by series (dimensional listing))Unicel note: Note: For use on 1-1/2" male SAE stand pipe.
- Filbur FC-0172 confirmed by: Pleatco p.48 (Filbur to Pleatco cross reference) Filbur p.34 (Reverse cross reference (Unicel to Filbur)) Filbur p.9 (Dimensional cartridge listing)
Check before you order
- Unicel 4CH-949 lists length 13-1/2" vs 13-3/16"; measure before ordering.
- Filbur FC-0172 lists length 13-1/2" vs 13-3/16"; measure before ordering.
Published dimensions, side by side
Each manufacturer measures a little differently. Compare these with your old cartridge.
| As published by | Pleatco PWW50L source | Unicel 4CH-949 source | Filbur FC-0172 source |
|---|---|---|---|
| Outside diameter | 5" | 4-15/16" | 4-15/16" |
| Length | 13-3/16" | 13-1/2" | 13-1/2" |
| Top end | Handle | / v-groove semi-circular handle | Handle |
| Bottom end | 1-1/2" FEMALE SAE | / 2" female SAE thread | 2" Fem SAE |
| Filter area | 50 sq ft | 50 sq ft | 50 sq ft |
| Pleats | not listed | 210 | not listed |
| Media weight | 3 oz/yd² | 3 oz/yd² | not listed |
Where to buy
Search any retailer for 4CH-949 or PWW50L or FC-0172. 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.
| OEM number | Listed in |
|---|---|
817-4050 | Pleatco p.32: OEM part # column Unicel p.64: OEM cross reference: Waterway Plastics |
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.
FAQ
What is the Unicel equivalent of Pleatco PWW50L?
The catalogs cross-reference Pleatco PWW50L to Unicel 4CH-949.
What is the Filbur equivalent of Pleatco PWW50L?
The catalogs list Filbur FC-0172.
What size is the PWW50L filter?
Pleatco lists PWW50L as 5" outside diameter by 13-3/16" long, top: Handle, bottom: 1-1/2" FEMALE SAE, 50 sq ft.
Which OEM part numbers does it replace?
Listed OEM numbers: 817-4050.
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.