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The Filbur FC-3966 is the correct compatible replacement for the following pool and spa filter:
The Filbur FC-3966 Caldera 100 Pool & Spa Filter is made of 100 square feet of Reemay spunbound polyester media. This Caldera 100 filter contains end caps that are made from durable polyurethane material. The center core of this FC-3966 pool filter is made of punched PVC pipe for consistent flow.
The Filbur FC-3966 specifications: