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The Filbur FC-6445 is the correct compatible replacement for the following pool and spa filters:
The FC-6445 Hayward CX870RE 4 Pack Pool & Spa Filter is made of 45 square feet of Reemay spunbound polyester media. This four pack of compaitble Hayward CX870RE spa filters contains end caps that are made from durable polyurethane material. The center core of these FC-6445 pool filters is made of punched PVC pipe for consistent flow.
The Filbur FC-6445 specifications: