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The Filbur FC-9820 is the correct compatible replacement for the following pool and spa filter:
The FC-9820 Sta-Rite System 3 S7D75 Pool Spa Filter is a diatomaceous earth (D.E.) filter grid. This Swimquip filter is made of 100% polypropylene cloth for superior filtering of your pool and spa water. The frame of this Filbur D.E. grid is made of strong and durable materials. The dimensions of this Filbur DE grid are 18 inches long by 9 11/16 inches wide.
The Filbur FC-9820 specifications: