Waterbox Felt Filter Sock – 4 in (11 cm), 225 Micron, 26 cm Long

Waterbox filter socks are polypropylene felt bags that catch detritus and fine particles from the water column as water drains into the sump, keeping the aquarium crystal clear. They are washable and reusable, and come in different micron ratings: 225 micron for general use and 100 micron for finer polishing. Choose the ring size that matches your sump’s sock holder.

Key features of the Waterbox Felt Filter Sock

• Polypropylene felt
• Traps detritus
• Keeps water clear
• Washable and reusable
• Several micron ratings

Choosing ring size and micron

Three socks are listed: 2.75 in (7 cm) and 4 in (11 cm) ring sizes at 225 micron, and a 7 in (18 cm) ring at 100 micron, all 26 cm long. Measure the inside of your sump’s sock holder before ordering, since the ring must sit snugly. A 100 micron sock traps finer particles but clogs faster, so it needs changing more often than a 225 micron sock.

Good to know

Change the sock every few days, before it clogs and overflows, then rinse it, soak or machine wash it and let it dry fully before reusing. Keeping a spare makes rotation easy.

Waterbox Felt Filter Sock specifications

• Brand: Waterbox
• Brand website: waterboxaquariums.com
• Product: Waterbox Felt Filter Sock – 4 in (11 cm), 225 Micron, 26 cm Long
• Ring size, micron rating and length: 4 in (11 cm), 225 Micron, 26 cm Long
• Material: Polypropylene felt
• Category: Fish Filters & Media