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The Filbur FC-4010 is the correct compatible replacement for the following pool and spa filters:
The Filbur FC-4010 Doughboy 40 sq ft Pool & Spa Filter is made of 40 square feet of Reemay spunbound polyester filter media. This compatible Doughboy spa filter cartridge is constructed with end caps made from durable polyurethane construction material. The center core of this FC-4010 spa filter is made of punched PVC pipe for consistent water flow.
The Filbur FC-4010 specifications: