Filter media is the core of proper aquarium filtration and helps keep the inhabitants of your aquarium healthy. The filter media is vital for all aquariums as it maintains the nitrogen cycle and removes harmful pollutants from your water. The filter media is an important component in keeping your water quality at its very best and keeping the overall health of aquarium to the highest standard. There are three fundamental types of aquarium filter media which work in harmony, each providing a vital job to help keep your aquarium a clean and healthy. The three fundamental types are Mechanical, Biological and Chemical. For the best results endeavour to achieve a 3-stage aquarium filter that incorporates all three media types to guarantee success in your aquarium. Here at Seahorse Aquariums we stock all three types of filter media from all the best brands such as JBL, Rowa phos and Juwel.