Bio Cup R


The next best thing to Filter Sock, the BIO CUP R supplements your traditional Filter Sock making reefing stress free. It is not only reusable, but easy to insert and remove when changing out filter pads, allowing your water to always be crystal clear. It works as a filter media basket that can hold different types of filter media such as filter floss, filter foam and pads, activated carbon, GFO, and bio media such as ESHOPPS BIO LUX. It fits perfectly into any 4×7” 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 4×7” rectangular filter sock cradle.
7.5×4.5×7″ (190x114x178 mm)
1 lb (453 g)
Tank Usage
up to 180 gal (681 L) max
Max Flow
500 GPH (1,892 LPH)