Bio Cup R Rectangular Filter Media Cup

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Say goodbye to filter socks with the Bio Cup R from Eshopps! This rectangular filter media cup is not only reusable, but easy to insert and remove when changing out filter pads, allowing your water to always be crystal clear. It can hold different types of filter media such as filter floss, filter foam and pads, activated carbon, GFO, and biomedia such as Eshopps Bio Lux. It fits perfectly into any 4”x7” filter sock cradle and easily accommodates stacking of different media types.



  • Easy to insert & remove
  • High flow design
  • Compatible with all Eshopps filter sumps equipped with 4”x7” rectangular filter sock cradle



  • Dimensions: 7.5” x 4.5” x 7”
  • Recommended Tank Size: Up to 180 Gallons
  • Recommended Flow:  Up to 500 GPH
  • Weight: 1lb
More Information
UPC 793888791008
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Product Questions

Will it fit rs reefer 170 sock?
Question by: Husnain Nazir on Aug 16, 2022, 12:39 AM
Thanks for the question! This will not fit the Red Sea Reefer filter sock holders. For this tank, you'll want the 4" Filter Media Cup SKU 211639 from Red Sea. Please let us know if you have any other questions!
Answer by: Kyle Thomas (BRS Staff) on Aug 17, 2022, 1:28 PM