Pleatco PBF35 = Unicel 8CH-950 = Filbur FC-0536
35 sq ft hot tub filter, 8" diameter × 5-7/8" long. Top: Handle · Bottom: 2" modified ACME(short). Pleatco application: Bullfrog 35, 2003-2012 (short thread).
Interchangeable cartridges
- Unicel 8CH-950 confirmed by: Pleatco p.47 (Unicel to Pleatco cross reference) Unicel p.20 (Cartridges by series (dimensional listing))
- Filbur FC-0536 confirmed by: Pleatco p.48 (Filbur to Pleatco cross reference) Filbur p.34 (Reverse cross reference (Unicel to Filbur)) Filbur p.12 (Dimensional cartridge listing)
Check before you order
- Unicel 8CH-950 describes the bottom thread as '/ 2" SAE thread' vs '2" modified ACME(short)'; check your thread type.
- Unicel 8CH-950 rates it 50 sq ft (vs 35 sq ft); filter area ratings differ by maker.
- Note: The 8CH-950 has been discontinued by Unicel. Use 8CH-951.
- Filbur FC-0536 describes the bottom thread as '2" SAE' vs '2" modified ACME(short)'; check your thread type.
Published dimensions, side by side
Each manufacturer measures a little differently. Compare these with your old cartridge.
| As published by | Pleatco PBF35 source | Unicel 8CH-950 source | Filbur FC-0536 source |
|---|---|---|---|
| Outside diameter | 8" | 8" | 8" |
| Length | 5-7/8" | 6" | 5-3/4" |
| Top end | Handle | / semi-circular handle | Handle |
| Bottom end | 2" modified ACME(short) | / 2" SAE thread | 2" SAE |
| Filter area | 35 sq ft | 50 sq ft | 35 sq ft |
| Pleats | not listed | 250 | not listed |
| Media weight | 3 oz/yd² | 3 oz/yd² | not listed |
Where to buy
Search any retailer for 8CH-950 or PBF35 or FC-0536. 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 |
|---|---|
10-2785 | Pleatco p.35: OEM part # column |
10-1035 | Unicel p.30: OEM cross reference: Bullfrog Spas |
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.
- Bullfrog Spas (OEM 10-1035) Unicel p.30
FAQ
What is the Unicel equivalent of Pleatco PBF35?
The catalogs cross-reference Pleatco PBF35 to Unicel 8CH-950.
What is the Filbur equivalent of Pleatco PBF35?
The catalogs list Filbur FC-0536.
What size is the PBF35 filter?
Pleatco lists PBF35 as 8" outside diameter by 5-7/8" long, top: Handle, bottom: 2" modified ACME(short), 35 sq ft.
Which OEM part numbers does it replace?
Listed OEM numbers: 10-2785, 10-1035.
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.