Help keep your sensitive underwater sidekicks’ environment healthy with Cobalt Aquatics Total Reef Aquarium Pollutant Removing Resins. This cleaner is designed for reef aquariums with sensitive stony corals， clams and invertebrates. The highly durable resin removes pollutants at low concentrations like organics， nitrite， nitrate， phosphate and metals. When exhausted， it will not release the collected pollutants back into the water. Plus， thanks to its ability to regenerate， you can use Cobalt Aquatics Total Reef Aquarium Pollutant Removing Resins time and time again.