6x Premier Bio Ceramic Rings in Bags 4 Aquarium Fish Pond Reef Canister Filter. They look solid, but actually there are millions of tiny holes in it. They are good to use for both fresh and saltwater aquariums.
A substantial quantity of very good quality ceramic rings used a a place for benificial bacteria to thrive on in both your pond and canister filters. The best price I have ever found for this type of media. Expect to pay 10x the amount at a pet store on aquarium supply. Also the are in very handy zippered pouches that are placed directly into the filter. And unbeatable value for an excellent quality product. I'll probably never have to purchase more as these will last forever. Thanks again. 5 stars.
Great quality. They come in 6 separate one pound bags that are nylon mesh with a full plastic zipper so they will not rust in your sump or whatever kind of filter (if you decide to leave them in it) Would definitely rinse them before use since there is some power residue from the friction of shipment. Definitely will be buying more for my new project!!!
I've been a fish keeper for over 40 years and always use a good porous media for having a large bacterial bed. It is important to have for the nitrate cycle that converts your fish's waste into a unharmful byproduct. The media arrived clean, safely packaged, and ready for use. 2 thumbs up!!!