Eshopps Large Foam Filter 4 x 2.25 x 13.5 Inches Go to amazon.com Related posts Best aquarium filter sponge for 2022 FeatureMade with a durable materialReplacement sponge for RS-100, RS-200 & RS-300Can be rinsed off for multiple reusesFilters out particles and debris DescriptionEshopps - Square Large Foam. Replacement filter foam is designed to provide extra filtration in Sumps and Wet/Dry Filters.