Red Sea

4" Filter Media Cup

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Run Carbon GFO or any other media in the Red Sea Filter Media Cup.

Pack the Red Sea Filter Media Cup with filter floss, ceramic media, carbon, gfo, or any other media you want. The slots at the bottom half of the cup force water to flow down through your media before it can freely exit. With the included media bag, you can manipulate your aquarium's water to go through a wide variety of media, carbon to help remove any toxins or yellowing pigments in the water, GFO to help remove phosphates or a biological substrate like MarinePure for the added surface area. The Filter Media Cup is an ideal and cost-effective replacement to filter socks as well. If all you want is to polish the water of free-floating particles, then placing a few handfuls of a filter pad in the cup is all you need to do, merely replace the dirty pads every few days. 

  • Replaces filter socks
  • Create your own custom filter tower
  • Works with all Red Sea Reefer & most MAX systems (excluding MAX Nano)
  • Compatible with most pre-made sumps 
  • Includes media bag



  • Dimensions: 4" x 8"
  • Min Sock Opening: 3.5"
  • Capacity: 1L
  • Media Bag Size: 5" x 10"


What's Included?

  • 1x Filter Media Cup 
  • 1x REEF SPEC Media Bag
More Information
UPC 730773421770
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Product Questions

Are these flexible? I'm wondering if they can be squeezed into the gap in many filter sock holders. It's going to be limiting if there needs to be enough space above the holder to drop these in from the top. Thanks for your time.
Question by: Jeff on Jan 20, 2020, 4:14 PM
Hey there!

They are not flexible as they are made of acrylic. And shape bending would surely crack the cup.

Take care
Answer by: Thomas Billington on Jan 23, 2020, 2:46 PM
I currently use the BRS branded filter sock mount & socks. Can this filter cup be held in place by the BRS mount?
Question by: John on Jul 30, 2018, 1:47 PM
Thanks for reaching out to us John. Those will indeed fit the BRS 4" filter sock mount. Happy reefing! :)
Answer by: Brad Ohmann on Jul 31, 2018, 6:31 PM