4 inch Felt Filter Sock With Plastic Ring

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Discontinued by Bulk Reef Supply
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The IceCap Standard Felt Filter Sock is made of thick floss material ideal for removing small particulates from your water column and the plastic ring is designed to fit most common sock holders. Filter socks are used as an effective first stage of an aquarium’s filtration process and should be placed so that water coming from the tank filters into the filter sock first, removing uneaten food, detritus, organic waste, dust and other small particulates from aquarium water. This dramatically improves water quality, reduces maintenance on pumps, reduces sump cleaning and lessens the load on the biological filtration by removing waste before it breaks down. The routine use and rotation of filter socks will help reduce ammonia and nitrate producing organic waste from accumulating.



  • Filter Material: 100 micron polyester weave
  • Dimensions: 4” x 14”


Important Note: These are standard filter socks for common sumps, and are not compatible with IceCap Sumps.

More Information
UPC 680490919190
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Product Questions

I have a skimz up22 sump with 4 x 9.45 sock and 4 x 14 filter sock. My question is will this ring fit my sump? I have tried generic felt socks previously and it wouldn't fit/seat at all and I HATE these mesh socks
Question by: Keith J Holland on Dec 26, 2021, 3:00 PM
Hello Keith, Yes this sock should fit your sump, but please keep in mind that often with filter sock plates, you may need to squeeze the plastic ring a bit in order to make it fit, this happens with different sump brands and it is normal as it prevents the socks to sitting loose in having water bypassing the filter sock.
Answer by: Christian Jimenez (BRS Staff) on Dec 30, 2021, 2:10 PM