Biological Filtration Done Right!


Robin’s Nest is a leader in Biological Filtration in New England. Their 25 years of experience, hard work, and intuitive design and engineering will leave you with a smile on your face and enjoying every moment next to, in, and around your new water garden, swim pond or natural waterfall.


Pond Biological Filtration (Bio-Filtration) uses a pump, plants filter area and usually a waterfall return to filter and aerate existing or new earthen or lined ponds. Some refer to it as a sort of bog filter.


Using an energy-efficient pump, proper plumbing, and native plant and stone material, a client can expect something very functional and beautiful at the same time. We like to think of it as a reward to the client for doing the right thing for his property, water, and the environment.


Bio Filter Construction


Constructed bio-filters, often referred to as bog filters are very similar to leach fields for septic systems, with a few exceptions:

  1. Bio-filters are open on top and planted heavily with filtering plants.
  2. Bio-filters pump water from the pond, through the filter, and returning back to the pond via a man-made waterfall and/or brook.
  3. Beneficial bacteria are introduced to substantially reduce organic matter and break it down.
  4. Cleaning the filter is done by thinning the plants and back-washing it annually.



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