The Aquaforte DM Vario-S series pumps are suited for outdoor use and are suited for wet and dry applications. With the external controller you can adjust the flow (and thus the energy consumption) from 30% to 100%. The controller can also start/stop the pump (pause button) . Provided with a synchronous motor and wearproof ceramic shaft for long time use. Automatic power-off protection when running dry. When the impeller is blocked it will go into a “lock” position in which the pump does not use power and waits until the blockage is gone. This will prevent a motor burn out.