Keep your koi pond looking pristine with Dr. Tim’s Aquatic Koi Re-Fresh Aquarium Cleaner. This potent cleaner contains a combination of beneficial bacteria that work to keep the surface of your pond clear and clean. It’s especially helpful for extremely dirty ponds and is designed to reduce both organic residue and unpleasant smells. This cleaner is also completely natural and safe for aquatic plants. Your fishy pals will be happy to swim around in a fin-tastically fresh and clean environment!