High flow aquarium filter media bag: optimal for activated carbon,these 3x4'' small filter bags compatible with most kinds of small filter media such as pelletized and granular carbon, zeolite, peat, crushed coral, barley pellets,and other types of granulated filter media. BUT NOT for fine filter media.

Universal small filter bags: 3"x4" bags, 1000 micron high-flow mesh ,suitable for granulated filter media ,fit variety of filters including canister filters, power filters, sumps, wet/dry filters and pond filtration systems.Fit for high flow filters,NOT for fine filter media,not for purigen.

Durable and reusable material:these aquarium mesh filter bag made of high quality Nylon, durable, washable, and can be reused. Easy to fill and empty with top drawstring design to keep filter media secure.

Drawstring style filter bags: unlike the zipper bag, our fish tank filter bag is drawstring style, not contain metal which may easily get rust and pollute your water, more safety for media fiters,and prevent loose media from potentially causing damage to your water pump or power filter's motor.

Package included: come with 6 pcs 3 inch by 4 inch mesh bags,ideal for use in any canister filter, hanging filters, sumps, and pond filtration systems,perfect for granular activated carbon, peat fiber, pellets, resins and any type of biological or chemical filtration.