3
1.1
Pre
‐
filter
The
pre
‐
filter
should
be
checked
every
3
months
and
cleaned
every
6
months
if
necessary.
The
cleaning
interval
can
then
be
extended
depending
on
the
build
‐
up
of
contaminants.
The
integrated
non
‐
return
valve
must
be
checked
twice
a
year
and
cleaned
of
any
dirt
or
deposits.
Newer
Aqualoop
versions
are
being
installed
with
solenoid
activated
auto
‐
back
‐
flush
kits
attached
to
the
pre
‐
filter.
This
means
that
maintenance
is
reduced
but
the
pre
‐
filter
should
still
be
checked
regularly
in
case
of
blockage.
1.2
Suction
and
backwash
pumpset
It
is
recommended
that
a
function
test
of
the
pumps
is
carried
out
every
six
months.
Each
pump
is
started
in
the
test
menu
4.
In
the
case
where
one
pump
should
fail,
the
complete
double
pump
unit
should
be
replaced.
It
is
suggested
that
the
filtration
and
backwash
pump
set
be
replaced
after
20,000
hrs
running
time.
Please
rerun
the
water
‐
tightness
test
to
ensure
there
are
no
air
leaks
in
the
pipework
after
the
replacement
of
the
double
pump
unit
(s.
section
9.1).
1.3
Float
switch
It
is
recommended
that
a
function
test
of
each
float
switch
is
carried
out
every
six
months.
The
float
switch
is
tested
by
manually
inverting
it
into
the
two
switch
positions
(Empty=lower
position
/Full=upper
position)
while
the
display
is
checked.
Fig.:
lower
position
‐
>Display
=
Br
min
‐
Fig.:
upper
position
‐
>
Br
min
+
It
is
vitally
important
that
the
Br
min
float
switch
was
set
originally
at
the
correct
depth
for
full
functioning
operation.
This
should
be
checked
during
maintenance
visits
AND
also
ensure
that
the
float
switch
cannot
become
tangled
in
other
hoses
within
the
bioreactor
OR
get
caught
up
on
the
side
of
the
bioreactor
wall.
This
will
cause
the
suction
pump
to
malfunction
and
possibly
burn
out.
