Keep routine filter maintenance simple and under budget. 100-Micron Felt Filter Socks 4" Round by Drs. Foster & Smith offer a sensibly priced solution, so you can stop reusing old or worn filter bags!
Easy-to-install mechanical pre-filter bags are great for any sump filtration system. Install over filter drain pipes to trap and remove free-floating debris and ammonia-producing organic matter from your aquarium water column. The felt filter bags also keep larger objects (sand, rubble, snail shells) from entering the pump chamber, helping to prevent costly pump damage.
100-Micron Felt Filter Socks 4" Round by Drs. Foster & Smith measure 4" diameter x 12" long and are available in a 3-pack or 6-pack.
Also available in 7" dia x 16"
Shop all Drs. Foster and Smith Filter Media.
Shop all Mechanical Filter Media.
Shop all Filter Media.
Benefits of Mechanical Filtration
About Drs. Foster and Smith
Mechanical filtration can greatly improve the health of most aquariums and is also important for efficient biological filtration. The process is simple: mechanical media traps solid debris such as fish excrement, sludge, uneaten food, or dust from your aquarium as water passes through. Debris-laden media can then be mechanically removed and rinsed or replaced with ease. This not only reduces the amount of solid debris in your water but also prevents debris from rapidly clogging biological media and creating conditions that prevent efficient breakdown of waste.
Centered in the heart of beautiful Northern Wisconsin, Drs. Foster and Smith is the largest direct-to-your-door pet supply source in America. Thanks to your continued support, Drs. Foster and Smith is honored to have been providing quality at-home pet healthcare and everyday essentials at prices everyone can afford for over 30 years. What started out in 1983 as four modest animal hospitals in rural Wisconsin is now a thriving effort to educate and empower families nationwide with products for your pets selected by our veterinarians.