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5" Filter Sock holders (typical to Waterbox aquariums)
There are two ways to get the perfect filtering replacement for felt or mesh filter socks:
It can handle receiving water from multiple tanks via a 3-3/4"x8-1/2" opening in the top with customizable attachable lid and filtering it at down to as low as 30 microns
Cycle timing
attach the fresh media and you're ready to filter
3-1/2" Filter Sock Cup - Filter Sock Replacement System (RedSea 250, 350 and 525) frag 5" Filter Sock holders (typicalFilter Sock cup for 3 1 2" Filter Sock holders (RedSea 250, 350 and 525 aquariums). Getting tired of dealing with those gross filter socks? Look no further Tested on RedSea 250, 350 and 525. There are two ways to get the perfect filtering replacement for felt or mesh filter socks: Complete: Use some filter floss. Cutout a disk of filter floss Tuck the filter floss into the cup then top' with other media like filter fiber or keep them plain; any way