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Great question! These 4" mesh filter socks will fit the RedSea Reefer 250.
great By Bob_M on 7/5/2017Bob_M would recommend this product to a friendThe people at SKIMZ used their heads when engineering this produce and the smaller one. They are both easy to clean, they dry quickly, and leave no offensive orders behind as some of the felt socks do.
Works Well By Chad on 3/25/2017Chad would recommend this product to a friendWorks really well in their sumps. Take note that it is not a standard 4" diameter. Is easy to clean and is holding up well to washing.