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.
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