Bullfrog 10-1035 Filter Cartridge
Bullfrog OEM number • 50 sq ft • 8″ OD × 5.875″ long
10-1035 is Bullfrog's number for this cartridge, not a part you have to buy from Bullfrog. The filter itself is a 50 square foot cartridge measuring 8 inches across and 5.875 inches long, and Pleatco, Unicel, and Filbur all build it. If you read 10-1035 off an old cartridge or found it in your manual, any of the numbers below drops into the same housing.
Fitment notes
Semi-circular handle top with a 2 inch SAE threaded bottom. Pleatco's Bullfrog 50, confirmed through Bullfrog OEM 10-1035, which Unicel resolves to the same 8CH-950 at matching diameter, end caps and rating. Measure your old cartridge before ordering the Unicel part: Unicel has discontinued the 8CH-950 and replaced it with the 8CH-951, which is 5-3/4 inches long against this one's 5-7/8 and carries 40 sq ft instead of 50. The PBF35 is the part that matches that shorter envelope, under Bullfrog OEM 10-2870.
What to buy instead
Replacements for the Bullfrog 10-1035
Each button searches Amazon for one of the numbers this cartridge is sold under. The OEM version is usually the most expensive of the set and the aftermarket versions are the same physical filter, so it is worth checking all of them before you order.
Every number for this filter
| Brand | Part Number | Type |
|---|---|---|
| Bullfrog | 10-1035 | The number you searched |
| Pleatco | PBF50 | Aftermarket equivalent |
| Unicel | 8CH-950 | Aftermarket equivalent |
| Filbur | FC-0536 | Aftermarket equivalent |
Full specs, the cartridge diagram, and the complete compatibility list live on the PBF50 cartridge page. You can also see every 8″ × 5.875″ cartridge if you are checking a measurement rather than a part number.
Frequently Asked Questions
What filter replaces the Bullfrog 10-1035?
The PBF50 replaces it directly, and so does every cross-reference for it: 8CH-950, FC-0536. All of them are the same 50 sq ft cartridge at 8" outer diameter and 5.875" long. Buy whichever is cheapest at the time with solid recent reviews.
Is the Bullfrog 10-1035 the same as the PBF50?
Yes, physically the same filter. Bullfrog 10-1035 is an OEM number, meaning it is the code Bullfrog put on the cartridge that shipped with the equipment. Bullfrog does not manufacture cartridges. Pleatco, Unicel, and Filbur do, and they sell the identical part under their own numbers at a lower price. Match the dimensions against your old cartridge before ordering and you are covered.
Do I have to buy the Bullfrog version?
No. Nothing about the housing requires an OEM-branded cartridge, and the warranty on your equipment is not voided by using an aftermarket filter that meets the same spec. The reason to buy OEM is convenience, not performance. The reason not to is price, which is often a meaningful gap for an identical part. What matters is that outer diameter, length, and end-cap style all match.
What size is the Bullfrog 10-1035?
8 inches in outer diameter, 5.875 inches long, with 50 square feet of filter media. Both measurements need to land within about an eighth of an inch, and the end caps have to match so the cartridge seats correctly when you close the lid. Measure your old one rather than trusting a number that has worn off the label.
Last verified September 2026