Filter Media Bag 12" x 18" (30cm x 45cm) 4mm 5/32", Pond and Aquarium Filtration Pond H2o's Water Garden Pond Aquarium Filter Media Bag with a drawstring and plastic toggle to hold closed. Strong High quality materials designed to hold all types of filter media. Filter Media Bags allows custom chemical filtration. Simply fill the media bag with the filter media of your choice and place in your filter for enhanced aquarium or pond water quality. Inexpensive and versatile filter media bag is made of 100% polyester featuring a top drawstring for easy closure. Black micro fine mesh bag is great for biological rings, volcanic rocks, coral sands, ceramic rings, activated carbon, ammonia remover resins, or any of your favorite aquarium or pond filter media. Use media-filled bags in power filters, canister filters, or wet/dry filters to customize pond filtration. Re-usable, simply rinse with water and refill as needed. PondH2o Quality! ? 12 Inch x 18 Inch (30cm x 45cm) ? 4mm 5/32" High Quality Black Mesh ? Drawstring closure ? Easy to clean or change ? Holds any type of Filter Media ? Open mesh to allow water to free flow We sell many pond and aquarium products online, Check out our Store! Terms and Conditions. We use all approved forms of payments. Sales tax to be charged based on regulations. Please note that if there are any problems, contact us first via e-mail giving full details of any problem along with your user ID. We use USPS and UPS as our chosen carriers shipments to Hawaii, Alaska Puerto Rico may incur surcharges, contact will be made to advise before shipment at which point the order can be canceled if desired. Orders placed on Saturday/Sunday Public Holidays will be processed next working day. We pride ourselves on excellent feedback, if any part of the buying experience is not to your satisfaction, please contact us to rectify before leaving feedback. By committing to buy you are agreeing to the Terms Conditions stated above.