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 Proper flow rate through
the "Big Sister Filter".
Note water spilling over
mid-filter weir.
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"Big Sister Filter"
with 40 watt Aqua Ultraviolet Filter installed
in gravity return line of filter.
Example of Aqua Ultraviolet
filter installed with opposing ports. Note plumbing is maintained
at 3" pipe size prior to & exiting UV filter.
2" unions
are installed before & after the UV unit to facilitate periodic
servicing.
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Note 1/2" flexible PVC
pipe, 1/2" ball valve & miniature brass
"fire nozzle". This 1/2" line is connected to the incoming,
unfiltered water pumped from the pond.
 This
is a minimum maintenance feature we add to all installations.
One simply closes the main feed valve to the filter which diverts
pressure to the 1/2"
line & allows the owner to spray, under pressure, the prefilter
brushes & the mat media.
One
should always alternate the spraying of filter media with time
- approximately one week - between prefilter media & main
media to prevent large population losses of beneficial nitrifying
bacteria.
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Shown here is the proper
water level & flow rate of this filter with clean mat media.
Water should not be allowed to enter the filter at such a rate
that the water spills over into the top of the standpipe Tee
with clean mat media.
When the mat media becomes
clogged with debris the water level in this bio portion of the
filter will (as a result of back pressure from the soiled mats)
gradually rise & (if heavily neglected) begin to spill over
into the Tee, bypassing the media. This is an intentional fail-safe
design of the filter.
It also tells the user at
a simple glance, how dirty the mat media has become - the closer
the water level gets to the top of the Tee, the dirtier the mat
media has become.
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