PBF35 / 8CH-950 / FC-0536
35 sq ft replacement filter cartridge • 8″ OD × 5.75″ long
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Use the part-number links below to compare compatible cartridges. Prices and availability vary, so verify dimensions before ordering.
Cross-Reference & Interchangeable Part Numbers
| Brand | Part Number | Type |
|---|---|---|
| Pleatco | PBF35 | Primary |
| Unicel | 8CH-950 | Equivalent |
| Filbur | FC-0536 | Equivalent |
| OEM | Bullfrog 10-2785 | Original Equipment |
| OEM | Bullfrog 10-1035 | Original Equipment |
| OEM | Bullfrog 10-2870 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Hot Tubs & Spas
The following spa models use the PBF35 (or an interchangeable equivalent). Always confirm with your owner's manual.
Frequently Asked Questions
What are the dimensions of the PBF35?
The PBF35 measures 8 inches in outer diameter and 5.75 inches in length, with a open top and open bottom. It provides 35 square feet of filtration area. Always measure your existing cartridge or check the label inside the filter housing before ordering - outer diameter and length are the two critical dimensions, but end-cap style must also match.
What other part numbers are interchangeable with the PBF35?
The PBF35 is interchangeable with 8CH-950, FC-0536, and OEM equivalents including Bullfrog 10-2785, Bullfrog 10-1035, Bullfrog 10-2870. All of these share the same 8" OD × 5.75" dimensions and open top / open bottom end caps. When buying a cross-reference, confirm the end-cap style matches - a small difference in cap design can prevent proper seating in your filter housing.
How often should I replace a PBF35 filter cartridge?
The PBF35 (35 sq ft) is a mid-size spa filter. Plan on 12-24 months between replacements depending on how heavily the spa is used. Spas used daily or by multiple people will wear out filters faster than a spa used once or twice a week. A good rule of thumb: inspect it at every water change (every 3-4 months) and replace it when the pleats show tearing, channeling, or persistent discoloration.
How do I clean a PBF35 filter cartridge?
The PBF35 has open ends on both top and bottom, so water flows through freely. Remove the cartridge from its housing and rinse thoroughly with a garden hose, directing the stream at a 45-degree angle between the pleats - work from top to bottom, rotating around the cartridge. Avoid pressure washers, which collapse the pleats and permanently reduce filtration efficiency. For a deeper clean every 3-4 months, soak overnight in a hot tub filter cleaner solution, then rinse thoroughly. Never reinstall a wet cartridge if you're using a cartridge with a closed end - let it dry to prevent trapping moisture inside.
Which hot tubs and spas use the PBF35 filter?
The PBF35 is compatible with the following models: Bullfrog A-Series, Bullfrog R-Series. Always cross-check your spa's owner manual or the label inside the filter compartment to confirm the correct part number.
Dimensions
Specifications
| Outer Diameter | 8″ |
|---|---|
| Length | 5.75″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 35 sq ft |
| Primary Brand | Pleatco |
| Part Number | PBF35 |