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The Filbur FC-1635 is the correct compatible replacement for the following pool and spa filters:
The Filbur FC-1635 Sonfarrel 50-5 Pool & Spa Filter is made of 50 square feet of Reemay spunbound polyester media. This Sonfarrel 50-5 filter contains end caps that are made from durable polyurethane material. The center core of this Sonfarrel filter is made of punched PVC pipe for consistent flow.
The Filbur FC-1635 specifications: