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High quality sheet foam can be cut to any size giving a large economical filter surface and can be used in conjunction with filter wadding for sparkling water quality. 3-piece foam packs are available to fit virtually all types and sizes of biological box filters. Normally supplied in three different grades of dimpled foam per set. Approximately 11" x 17", 16" x 24" and 19" x 25".most pumps.
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