The Max-Flo 4000 pond pump offers the perfect amount of flow for a \'typical\' garden pond (8,000 litres). It is designed to push water to a filter or waterfall and can be left to run 24/7 with little maintenance. It can handles solids up to 6mm so the impeller is unlikely to block and the pump comes with a three year guarantee. This is the latest version of the Max-Flo and replaces the old 3,500 version.The new design includes Smart Pump Technology (SPT), this feature is an advanced motor that constantly monitors pump performance and adjusts itself to its environment to maximise its performance - this makes the pump more economical too! Laguna pumps are known for their reliability - a fact illustrated by the long 3 year manufacturers warranty you receive with this pump.