Taking care of a pond is similar to maintaining a swimming pool. In addition to a pump to aerate the water, most ponds use a filter to remove excess sediment. Some more complex designs also include a skimmer to suction debris from the surface. The entire filtration system needs to be cleaned at least once a year. And some pond specialists suggest hosing off filters every six weeks or so to cut down on buildup. Every three to five years, the pond should be completely drained for a thorough cleaning. Depending on your climate and cash flow, you can invest in a multitude of other pond paraphernalia, like bacteria-killing UV lights, a heater to keep the surface from freezing, a pool vacuum, and a winter cover.