4″ Media Cup Reefer Filter – Red Sea

About this product

Red Sea 4″ REEFER Filter Media Cup. A reusable, easy-clean alternative to a 4-inch aquarium filter sock, designed to hold up to 1 liter of filtration media. The cup lets you customize your sump filtration with filter floss, activated carbon, phosphate-removal media, or biological media.

Slots in the lower portion of the cup direct incoming water down through the media before it exits into the sump. Use filter floss for mechanical particle removal or the included media bag to contain suitable loose media. The removable design makes media changes and routine cleaning straightforward.

Features:

• Reusable alternative to compatible 4-inch filter socks

• Holds up to 1 liter of filtration media

• Supports filter floss, carbon, GFO, and biological media

• Lower outlet slots direct water through the media

• Allows customized mechanical, chemical, or biological filtration

• Includes a REEF-SPEC media bag

• Easy to remove for cleaning and media replacement

Specifications:

• Brand: Red Sea

• Product type: Sump filter media cup

• Product line: REEFER

• Nominal fitting size: 4 inches / 10 cm

• Media capacity: 1 liter

• Filtration type: Depends on the media selected

• Included components: 1 filter media cup and 1 REEF-SPEC media bag

• Media bag size: 5″ x 10″

• Compatibility: Compatible REEFER and MAX sump sock holders, plus many other 4-inch sump holders

• Compatibility exception: MAX NANO is excluded from the retailer’s fit listing

• Filter media: Selected separately

Confirm holder fit and available sump clearance before installation. Published overall dimensions vary between listings.