3 Foams ✔ ✔ ✔ ✔. Pond Filter Foam Layers. Add To Basket. Universal - for use in any filter box. Increased Surface Area. Cut to Size. Cut to Size ✔ ✔ ✔ ✔. Available in 4 sizes: 17" x 11" / 25" x 18" / 36" x 24" / 42" x 21".
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