Pond Pre Filters
Pond Pre Filters provide excellent mechanical filtration, removing dirt and larger pieces of debris before they fall to the pond bottom or reach your pump.
With no large particles to contend with, any clogging that results in damage to the pump or a reduction in its performance will be avoided. The amount of maintenance that you undertake will also be reduced.
In addition, the problem of sludge and decomposing organic matter producing harmful gases will be contained, instead you'll have lovely clear water and a healthy environment.