Dryden Aqua is the largest manufacturer of glass filtration media. AFM® Activated Filter Media is a direct replacement for sand, doubling the performance of sandfilters without the need of additional investments in infrastructure. AFM® resists biofouling, biocoagulation and transient wormhole channeling of unfiltered water and outlasts all other filter media. AFM® Activated Filter Media is a highly engineered product manufactured from a specific glass type, processed to obtain the optimum particle size and shape. It is then exposed to a 3-step activation process to become self-sterilizing and to acquire superior adsorption properties.As marine biologists, we have a unique knowledge combination and detailed understanding of the biological as well as the physio-chemical reactions in water. This has enabled us to develop and manufacture a highly innovative range of products such as the Activated Filter Media AFM®.