The fluval fx6 external filter is a high performance aquarium canister filter the very latest design from fluval offering super quiet operationr the fx6 compact super capacity canister processes and circulates 3500 litres of water every hour and accommodates the stack of media baskets with a capacity of up to 59 litres of mediar the combination of precision engineered baskets eliminate any water by pass designed at a height of only 54cm 21in the fx6 fits under most aquariums the filter