All Pond Solutions Aquarium EF+ External Filter Range. Keep your aquarium water clear and healthy. The EF+ Range is a self-priming, quiet running external aquarium filter with a built-in UV steriliser. It uses a multi-stage approach to filtration and filters your tank water through a number of distinct filter materials, which are separated into different layered baskets to provide biological, mechanical and chemical filtration to your aquarium fish tank. Includes 2000L/H flow rate and 9W UV light.