Fountain pumps clog typically due to excessive debris getting caught in the fountain’s pump. Debris such as leaves, plant and animal matter, and algae will clog a pump if the debris is not removed from the water. Pond owners may prevent this clogging to their waterfalls and fountains by using a pond filter system that strains debris. A simple pond skimmer can be made easily for a small pond. A skimmer is a box or container that protects the fountain pump behind mesh which catches any material before it reaches the pump.
KineticFountains.com suggests soaking the pond pump in white vinegar and water to remove debris, and then to remove the pump cover and clean out the inside of the pump. This will clear out any debris that has accumulated.
Reassemble the pump if it was taken apart to clean, and insert it into the back half of the container, away from the intake hole. Push the outflow hose, which leads to the fountain, through the hole in the lid.
Clean the homemade small-pond skimmer at least once a week or more if the water flow to the fountain seems obstructed. Turn off the pump and remove the container, then take the mesh out and rinse out the grime, debris and algae.