Aquarium Fish Pond Media Filter Foam Sponge 1 Set 17" X 11" Fine/Medium/Coarse. This universal filter foam set can be cut down into any size to fit your filter box for a pond or aquarium filter system. When filter foam become shrink and perish, we recommend replacing your filter foams at least annually or when they become miss-shaped or clogged. 1 x Fine filter foam - Blue. 1 x Medium filter foam - Green.1 x Coarse filter foam - Black. Each foam thickness of 25mm, size 430mmx275mm. Size & thickness are approximate - variations may occur due to manufacturing tolerances +/- 0.5cm. The item "1 Set (3pcs) Aquarium Fish Pond Filter Media Foam Sponge Fine/Medium/Coarse" is in sale since Monday, June 18, 2018. This item is in the category "Pet Supplies\Fish\Filters". The seller is "skyauctionaustralia" and is located in Doncaster East. This item can be shipped worldwide.