The new CF range of cartridge filters from Interpet, are an easy to install and easy to use filter from Interpet for freshwater (coldwater and tropical) aquariums. It is amazingly easy to fit using the sucker mounted support cradle, and this simply attaches to the inside of the aquarium glass. The filter then hooks onto the cradle, so no more fiddling around with a filter system that is trouble to fit. The product is easy to clean using the instructions below, and this is where your service kit will come in handy. We recommend you to change the pads once a month, but this all depends on the amount of fish you have in your aquarium. The Cartridge Filter offers you: Easy to remove, slot in disposable filter cartidges. Algaway Pad: Unique Algaway Pad reduces unsightly algae. Effective Four Stage Filtration: Biomedia - creates healthy water by acting as a home for essential bacteria which remove toxic fish waste. Mechanical Floss - clears water by trapping fine waste. Carbon - Purifies water by removing dyes, toxins, heavy metals and odours. Algaway Pad - reduces unsightly algae by removing phosphates, algae's favourite food. So, why would you choose from the rest, when you can buy from the best with confidence - Interpet - with over 60 years experience in the aquatics industry.