With this classical style of external filters, we employed a new system of water activation which Plocher Vertriebs established in Germany. The form of the filter canister is designed for effective circulation of water through the filter media which minimizes the burden on the motor and allows a long time use. A special device employing the Plocher Energy System, revives the activities of bacteria and microorganisms, and rejuvenates the aquarium water to a harmonized condition. The quality of the aquarium water and the overall conditions of the aquarium improves with the unique effects of Plocher Energy.