Fish Pond Filters

Written by Michael O'Brien
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Fish pond filters help keep a pond in great shape. Essentially, there are two types of filters. Biological filters are the more natural means of maintaining water purity, but mechanical filters also get the job done. Many pond owners find that both are beneficial, especially if their ponds host creatures other than plants, such as fish or frogs.

Types of Fish Pond Filters

Both mechanical and biological fish pond filters can be used together. While mechanical filters vacuum debris and algae from ponds, biological filters actually break down pollutants and turn them into helpful nitrates. Biological filters are recommended if there is wildlife living in your pond. Without a biological filter, fish and frogs can die from being overwhelmed with the toxic ammonia from their own waste. Mechanical filters will keep water clear, but is not as useful for animals.

Biological Filters

Biological fish pond filters take a different form than mechanical filters. Mechanical filters are a fan-like device that sucks water through while removing debris and harmful elements. Biological filters are simply a place where good bacteria live. The good bacteria provide an oxygenated environment that is healthy for pond life.

If you need to give your pond a quick make-over, you can add live bacteria in a liquid form, sometimes called a microbe lift. This is a good idea if you have not had fish living in your pond but would like to add some. It prepares the water faster than a biological filter can.

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