The Filter Pro 100 Micron Filter Sock is a high quality and reusable filter sock. These filter socks are easy to install and are great for any sump filtration system and wet/dry aquarium filters. These provide fine mechanical and biological filtration. Traps and removes free-floating debris, uneaten food and ammonia-producing organic matter for crystal clear aquarium water. This means healthy water conditions, and healthy aquatic plants and animals! These felt filter socks also keep larger objects from entering the pump chamber, helping to prevent costly pump damage. Also reduces maintenance on filters that would otherwise become clogged. These socks are extremely durable and are also reusable. They can easily be rinsed out and reused. Made in USA