SuperFish Aquaflow Internal Filter SuperFish Aquaflow Internal Filter – Aqua-Flow 50, 100, 200 and 400 Internal Filters – Aqua-Flow internal filters, compact and perfect for small and mid-sized tropical and cold-water aquariums. These filters remove the contaminants from the water and also ensure healthy and clean water. The Aqua-Flow filters are easy to install, equipped with a spray bar, adjustable flow (except Aqua-Flow 50) and an easily replaceable Easy-Click cartridge. Replace the filter cartridge once a month for optimal filter performance. SuperFish Aqua-Flow 300 and Aqua-Flow XL Triple Action filters – Large internal filters with Triple-Action filter cartridges. The first cartridge is filled with Filter foam and Activated Carbon. You will also need to replace this cartridge every month. The second cartridge is filled with CrystalMax, a very porous biological filter medium made from sintered glass. It also acts as a sponge for micro-organisms, decomposes waste products and harmful substances very fast and effectively. Perfect filtration for tropical and coldwater aquariums. Filters available: 50 FILTER 100 L/H UK 100 FILTER 200 L/H UK 200 FILTER 500 L/H UK 300 FILTER 540 L/H 400 FILTER 800 L/H UK XL BIO FILTER 500 L/H UK It is our goal to make your aquarium hobby successful and also affordable. Superfish surely makes your aquarium hobby successful, complete with aquariums, filters and filter media, heating, lighting, ventilation and also useful accessories. Click here to also browse a wide range of Superfish products we stock!