The Eshopps Bio Cup R Replacement Filter is a rigid acrylic media cup designed to replace traditional 4″ x 7″ filter socks in compatible Eshopps sumps. Instead of wrestling with soggy socks, you get a clean, reusable cup that makes filtration changes fast and simple.

Why switch to the Eshopps Bio Cup R?

• Goodbye messy filter socks – Lift the cup out, swap or rinse media, and drop it back in. No more turning socks inside out or constant replacements.
• Customizable filtration – Use your preferred media: filter floss, ceramic rings, carbon, GFO, or a combination tailored to your tank’s needs.
• High-flow design – Open water channels help maintain strong flow through the sump while maximizing contact with your chosen media.
• Reusable & cost-effective – Durable acrylic construction stands up to repeated use, helping reduce ongoing filter sock costs.
• Easy service access – Straight-sided cup is simple to grab, remove, and clean, making routine maintenance less of a chore.

Ideal for a range of aquarium setups

The Bio Cup R works well in both saltwater and freshwater systems where a 4″ x 7″ rectangular sock cradle is present. It’s especially useful for reef tanks and heavily stocked fish systems that benefit from flexible mechanical and chemical filtration.

Key features

• Designed to replace standard 4″ x 7″ rectangular filter socks
• All-acrylic construction for durability and rigidity
• High-flow water channels to support strong sump turnover
• Compatible with a wide range of loose or bagged filter media
• Supports tower-style stacking of different media types
• Reusable design for long-term use

Specifications

• Item: Eshopps Bio Cup R Replacement Filter
• Item #: 95864
• Dimensions: 7.5″ L x 4.5″ W x 7″ H
• Weight: 1 lb
• Tank size: Up to 180 gallons (max)
• Maximum flow rate: 500 gph
• Compatibility: Eshopps sumps with 4″ x 7″ rectangular filter sock cradle
• Quantity: 1 media cup

How to use

1. Remove the existing 4″ x 7″ rectangular filter sock from your Eshopps sump.
2. Fill the Bio Cup R with your chosen filter media (e.g., floss on top, carbon or GFO below).
3. Place the loaded cup into the 4″ x 7″ sock cradle.
4. Monitor flow and water clarity, adjusting media type or quantity as needed.
5. Lift out the cup for quick media changes or rinsing during regular maintenance.

If you want cleaner water, easier maintenance, and more control over your filtration, the Eshopps Bio Cup R Replacement Filter offers a simple upgrade over traditional filter socks.

Additional information