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The Filbur FC-1638 is the correct compatible replacement for the following pool and spa filters:
The Filbur FC-1638 Sonfarrel 100 Pool & Spa Filter is made of 100 square feet of Reemay spunbound polyester media. The center core of this Sonfarrel filter is made of punched PVC pipe for consistent flow. This Sonfarrel 100 filter contains end caps that are made from durable polyurethane material.
The Filbur FC-1638 specifications: