Use this Aquarium Bundle to make your water crystal clear and healthy for your aquatic life to thrive. This bundle includes activated aquarium carbon and media bags. The filter bags hold the activated carbon granules and have secure drawstring closures to keep loose media contained. With fine mesh， these filter bags for aquariums allow water to pass through the carbon thoroughly and efficiently. The bags also resist corrosion and are washable and reusable for long-lasting and reliable performance. Professional-grade bituminous activated carbon keeps water clear and removes discoloration， odors and other impurities. Suitable for fresh and saltwater aquariums， it undergoes a thorough cleansing and preparation process to give off minimal dust. Place the carbon in a fine mesh media bag where it removes toxins， chlorine and heavy metals from the water as it flows through. The items in this bundle are highly versatile and work with a wide range of indoor and outdoor filtration systems. Aquatic Experts Premium 3 lbs Activated Aquarium Carbon and Fine Mesh Media Bag， 3" x 8"， 4 Pack