Filter Selection
It is possible to achieve a balanced ecosystem
within a pond without the aid of artificial filtration, but it is a difficult
task which could take several years. Choosing an appropriate filter, especially
if fish are present, will greatly simplify the process of pond maintenance.
Care should be taken to select a filter capable of handling the Flow Rate
produced by the pump. If the filter is undersized, water will pass through
it too quickly, preventing the aerobic bacteria within from consuming organic
matter passing through. Either a pressurized or gravity-type pond filter
may be selected using these criteria:
The rated Maximum Volume of
the filter must be equal to or greater than the Effective Volume of
the pond. The Effective Volume of the pond may be determined by adjusting
the calculated actual volume of the pond as follows:
· If the average pond depth
is less than 2.5', add 25%.
· If the pond is in full sun, add 25%.
If a gravity-type filter is
used with a single pump powering the filter plus a waterfall or watercourse,
it must be located at the high point. Gravity filters are designed so that
the treated water will pour directly out of the filter into the pond or
stream.
Pressurized drum filters can
be located anywhere within pump Head limits. Most pressurized filters prefer
to have their own dedicated pump.
Sand vortex filters are generally unsuitable,
except in the case of chlorinated fountains.
NOTE: Fish stock should not
exceed 1" of
fish per 100 gal of filtration.
