What is Evolution Aqua Pure? Pure is a game-changing filter bacteria product that backs famous product ranges such as evoUV, Cetus Sieve, and EazyPod filter. Since the inception of Pure, it has significantly improved the way pond and aquarium owners mature their filters. The product has allowed them to reduce nitrate and ammonia as well as effectively treat water clarity problems. The Pure product range was developed by the award-winning British aquatics company, Evolution Aqua. At Everything Koi, we carry the latest range of Evolution Aqua Pure products, which can be bought conveniently from your home or place of business.