17 oz Ceramic Rings, Aquarium or Pond biological filtration comes with Mesh Bag Ceramic Rings 17oz. High Surface area Ceramic Rings for filters comes complete with Mesh bag. Perfect for any tropical aquarium, includes salt (marine) and fresh water fish tanks. High Surface area Ceramic Rings for filters complete with Mesh bag. Works best with a water flow across it. Provides a porous surface area to support biological filtration of your water. Helps keep a clean and healthy aquatic environment where fish, plans and aquatic life can thrive. Process allows the water to receive full-contact filtration with virtually no bypass so it can return to your aquarium or pond. Ceramic rings are extremely porous media for efficient biological filtration. Hollow design effectively distributes water flow and allows massive colonies of beneficial bacteria to grow. The more surface that is available, the more bacteria that your filter media can hold, they increase their surface area through tiny little pores. ? 17 oz Ceramic Rings in a mesh bag ? Helps keep a clean and healthy aquatic environment where fish, plans and aquatic life can thrive. ? Provides a porous surface area to support biological filtration of your water Terms and Conditions. We use PayPal for taking payment, if you wish to purchase via other methods please email us for customer service. Sales Tax will be added to all shipments to New Jersey. We always try to combine purchases, please contact us directly for a personal service. You will be notified on the day that your goods have been dispatched via e-mail with tracking which is used on all purchases. 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.