Medium Density is ideal for capturing larger particles, with the sponge being made up multiple holes approx. 4-5mm wide.
Use in a sump or cut down to fit in canister filters
Sponge size 38cm X 38cm X 5cm
Sponge filters are a biological filtration that builds up a colony a good bacteria that breaks down the ammonia and nitrite as water passes though them and also collect detritus to help keep a clean aquarium.