Gardens Pond filters
is the difference between a UV filter and a biological one?
BIOLOGICAL filter is essentially a sewage treatment station for
your pond. It relies on beneficial bacteria known as nitrifying
bacteria to process the fish waste from the harmful form that comes
out of the fish (ammonia) to the relatively harmless form that is
used by plants (nitrate). This process is called nitrification and
is the basis of all good filter systems.
A UV filter on the other
hand kills the algae that cause green water. Used together, and
properly installed and operated, these two units (which are often
sold as a combination unit) will guarantee you clear water.
Gardener, Issue 88, 2001, Page 22
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.