I tested in a bucket and it work, the brand of the filter is hopar canister external. I change one pipe since it was really nasty and I put the two tubes into my tank and it's not doing anything at all!!!
It has in and out outlet and I tried sucking both of the tubes but it didn't start, it's second hand which came with my tank. I position the filter onto the floor and the tank is sitting on my desk it about 120 litres...
I notice there is few parts missing e.g. Spray bar, strainer and few pipes