• Length: 18”

• Compatible replacement for Unicel FG-3917

The Filbur FC-9890 - DE Grid Pool Filter Replacement is a compatible replacement for the Unicel FG-3917 part. With its 17.75” diameter and 18” length, this Filbur pool filter follows the rules of quality typical for all the other swimming pool filters and spa filter produced by this company. Efficiency and endurance govern the way the pool filters are made by Filbur. When it comes to the resistance the FC-9890 spa filter prevents fraying. The sonic welded seams, the low number of glued joints and the reinforced frames will ensure the product’s stability and endurance. Furthermore, the 100% Polypropylene cloth of this swimming pool filter is made to make your life even better, since it can help you control the amount of DE that gets into your pool water.