Filter Sock Replacement Cup Reef Media Basket for Filter Floss & Bio Media, Fits 7x4.5 Inch Sock Opening, for Saltwater & Freshwater Sump

This filter media cup is designed to directly replace standard 7" x 4.5" filter bags, allowing you to say goodbye to the tedious filter bag cleaning work of the past and instead enjoy the minimalist and efficient maintenance experience of "take it out and throw it away".The innovative 4-inch deep basket serves a dual purpose. The upper section holds standard filter floss pads to polish your water and capture particulates. The lower section creates a dedicated chamber for biological media such as ceramic rings, Bio-Balls, or small live rock rubble. This design maximizes your sump space by combining mechanical and biological filtration in one compact unit.When dealing with high-flow-rate water, the open-wall structure of this product effectively prevents water accumulation and backflow, ensuring that all water flows smoothly through the filter media you choose.

• No More Cleaning Filter Bags: Simply line the cup with a layer of filter floss; when the floss becomes soiled, just remove the media cup and discard the dirty material—no scrubbing required whatsoever
• Dual Action: The lower section provides dedicated space for biological media (such as small live rock rubble), while the filter floss in the upper section captures particulate impurities
• Simple Weighting Management: To prevent the media cup from floating due to buoyancy, simply place a few small stones or appropriate weights at the bottom of the cup during installation
• Handles High Flow Rates with Ease: Featuring an open-sided design, this product effectively prevents water overflow and backflow, allowing it to easily handle the high flow velocities generated by powerful return pumps