Rectangle Sock 300 Micron (3pcs)

Keep your aquarium water clean, clear, and polished with these high-quality 300 micron filter socks—the perfect balance between strong mechanical filtration and consistent flow rate. Featuring a rectangular bracket design (7″ × 4.5″ opening), these socks fit perfectly in the Cube Medium Refugium Sump and most custom sump designs that incorporate rectangular sock holders.

With a 13″ length, these filter socks effectively capture large particles of detritus, food waste, algae fragments, and other debris before they reach your pumps, skimmers, or reactors. This protects your equipment while improving overall water clarity.

Why Use Filter Socks?

Filter socks are typically placed at the sump inlet to trap debris before it can circulate through the system. They also prevent small fish, snails, and other critters from entering pumps and getting injured.

To maintain optimal performance and prevent organic buildup from breaking down into ammonia and other toxins, socks should be cleaned or replaced every 3 days or as needed.

• Micron Rating: 300 micron

• Sock Length: 13″

• Opening Size: 7″ × 4.5″ (rectangular)

• Fits: Cube Medium Refugium Sump & compatible custom holders

• Use: Marine, reef, freshwater, and pond filtration systems