Koi ponds can be thought of as swimming pools for koi or simply big fish tanks. There are no rocks, gravel, or aquatic plants in the pond that could potentially harm the koi. Koi ponds are biologically and micro-filtered with super-efficient, easy to clean with our Hybrid filters along with our Hybrid skimmers. Keep your water buddies safe and playful with our koi ponds, our bio friendly filter maintains your koi ponds all time fresh.