Aquapapa 1 lb Activated Charcoal Carbon Pellets in Free Mesh Media Bag for Aquarium Fish Pond Tank Canister Filter Ready-to-use carbon filter bag, convenient for use with your canister filter, power filter, or pond filter. Removes odor, colors, organic pollutants to keep water crystal clear; removes toxic compounds from fish tank. Phosphate free. Safe for both fresh and saltwater tanks. Fast working and long lasting. Bagged for easy handling and precise placement of carbon and ensure granular media not travel thru pumps and pipes. Bag size: 8" x 5.5". Zipper-designed mesh bag is reusable. ****As with all carbon media, always rinse well till the water runs clear before use. ****