Actual Problem: The left side of the lid on
the filter keeps popping up causing noise. The
filter material wants to rise and there seems to
be nothing to lock it in. On the right hand side
there is a tab that the plastic insert locks into
but I can't get it to lock into anything on the
left side. This in turn allows the plastic insert
holder rise up, lifting the cover off.
Aquarium Size: 33
Aquarium Age: 24
Type of fish: African cichilids
Number of fish: 8
Last water change: weekly
Percent changed: 30%
Primary Filtration System: Aquaclear 300
Secondary Filtration System: na
Last Media Change: last month
The reason that a filter will have the media push
up is because the foam or other media is often so
dirty it creates more resistance than the tab on
the impeller well can tolerate. In essence this
is a warning that it is time to replace or rinse
the filter materials. Often this will be a sign
that the foam, which is oversized for the actual
compartment slightly, has filled and causing too
much resistance. It must be at least rinsed, but
if it is older and you are rinsing it often, then
this is a sign that the holding capacity has been
filled, and that it should be replaced with a new
foam.
The rising is just like a safety valve, when
pressure in a system rises too high, something has
to give, and the AquaClear uses the rising media
basket as a sign that the filter is overdue for
a cleaning. I must hasten to add that you should
never replace all the filter media at once, if you
do change the foam, rinse the carbon out well in
used aquarium water to conserve the beneficial
bacteria that are removing the ammonia and nitrite
from your aquarium. Once it has been rinsed
thoroughly in dechlorinated water (chlorine
or chloramine will kill the bacteria it takes so
long to grow) replace it into the filter. Wait at
least a week or two before replacing it with a new
insert to allow the chance for the new foam to be
seeded.
The foam is much longer lived that the carbon and
can be rinsed during every filter maintenance that
the carbon is removed. Just be sure that the water
you rinse is from a regular water change so it is
safe to the bacterial populations - we term this
multiple insert conservation of bacteria the
CycleGuard system.
Hope that answers your questions about the cause
and the fix of "rising filter media" in the
AquaClear system.