Four score and seven years ago our forefathers knew nothing about ponds or filtration. In fact, the early pioneers of the ornamental pond and koi-keeping hobbies were taxed to find methods to keep their water clean and clear and their prized fish healthy. Even now, with all our modern technology, we still find it difficult to create and maintain a healthy, clean pond environment. What we have learned is that it takes filtration - and lots of it!