Direct Drive Pumps have been the mainstay of the pond and water garden industry for the last decade. These pumps are powerful and generate a high volume of flow even when pumping to heights greater than 6-10 foot. Most direct drive pumps are constructed from metal and are heavier than their magnetic drive counterparts. Direct drive submersible pond pumps are perfect for very long streams or very tall waterfalls. The extra power they provide greatly adds to the visual effects of larger water features. Of course with the higher flow volume at greater heights comes a much higher energy cost. Direct drive pumps typically consume 2 to 3 times the electricity of a similar capacity hybrid magnetic drive pump. In areas with especially high electrical rates these pumps may cost more to operate than the consumer is comfortable with. Direct drive pumps are still the preferred pump of most professional pond installers. That statistic however is changing at a rapid pace. Direct drive pumps require a bearing and pump seals that will eventually fail. In the experience of many pond installers the direct drive pumps will fail at a faster rate than the comparable flow hybrid pump.
NOTE: Direct drive pumps require a certain amount of back pressure in order to operate at their capacity. This means that the pump actually lasts longer and performs better when pumping to approximately one half of its maximum lift capacity (head pressure). The use of a direct drive pump on a ground level filter or stream will require a flow reducer to prevent premature failure of the pump seals and bearings. For water garden applications of less than 3 foot you should consider a magnetic drive hybrid pond pump for savings and reduced wear on the pump.