;,
…
1
'
‘
‘
,
,
.»
»
‘
“_
Table4. (Continued),
,
‘
.
_
_
,
_
"
—__
_
0zohisation
Ozonised air should not be bubbled - Best used in, corhbinatidfis;
directly into the environment as it is
with protein
,
harmful to the inhabitants in direct high efficiency. Useful in
,
,
,
contact. Removes trace elements
"Sterile’ systems. C_orre_ét
Ï,
‘
from saltwater. Difficult to arrive
regulation must be ,
,
'
'
at correct rate of injection. ExceSs
achieved.
-
»—
—
ozone can harm inhabitants.
_
_
‘
,
Biological
Requires initial maturation period
The. most efficient sy'stei‘n
_
filtration
before becoming fully efficient with except whereplant growth
’
full population of bacteria, and toxic is important or the inhabi-,
leVels of ammonia may be reached
tants dig or liVe in the
‘
5
in this period in crowded or overfed
gravel. Externally fitted
,
'
*
,
environments. Medicines or other
systems can bedeveloped.
_
additives may kill bacteria and thus
Should be considered ,
_
_”
reduce efficiency. Çlogs up_ event—_
primary methodWhenüfer
‘
ually if too much mechanical filtra—'
possible.
'
[
tion takes place.
_
_
_
‘
Plant growth Requires deep gravel bed for rooting
Very decorative where :
_
‘
which may encourage
anaerobic
successful. Somemethod
,
«
areas.
Rooted plants do not grow well of urine removal also need’
Î
.in biological “beds. Takes up large
ed in fresh water. Algal
__
proportion of available spa'ce‘in the
gr0wth beneficial
"
,“
"environment.
_
water systems. .
*
Algal
Requires filter tray of large,dimenImpractical in
x
filtration
sions for efficiencyand also complex—situations. Resulting
'
"
Water circulation system.’Efficiency
efficiency‘probably not _
_
also dependent upon available light.“
Worth'all
the trouble. ‘ î-Ÿ_"
_
this system is practical
which the fish do not:eat
the "plants. In many marine thirohments the filtering
'
be carried out equally by means of filter feeding organismS suChas
live corals, tube worms and, so on. This ‘natural’.meth0d is extremely
satisfy'ing When successfully accomplished but'for avariety of
_
is diffiCult to set up.
-
'
»
:
ï
Further methods of dealing" with ammonia_
utilise various items
_
_
'
of specialised equipment, either to “complete the nitrogen‘ cycleor
_
to. make its completion unnecessary by directly removinig
amm0ma
,
Ï from the environment. All types of filters and ' ski}nrher3
this
and are fully discusSed later (p. 45)The1r 1156 and… (
_
reliability depend
‘
on available power supplies'
Of
to…keep_ them operating.
…
1
'
‘
‘
,
,
.»
»
‘
“_
Table4. (Continued),
,
‘
.
_
_
,
_
"
—__
_
0zohisation
Ozonised air should not be bubbled - Best used in, corhbinatidfis;
directly into the environment as it is
with protein
,
harmful to the inhabitants in direct high efficiency. Useful in
,
,
,
contact. Removes trace elements
"Sterile’ systems. C_orre_ét
Ï,
‘
from saltwater. Difficult to arrive
regulation must be ,
,
'
'
at correct rate of injection. ExceSs
achieved.
-
»—
—
ozone can harm inhabitants.
_
_
‘
,
Biological
Requires initial maturation period
The. most efficient sy'stei‘n
_
filtration
before becoming fully efficient with except whereplant growth
’
full population of bacteria, and toxic is important or the inhabi-,
leVels of ammonia may be reached
tants dig or liVe in the
‘
5
in this period in crowded or overfed
gravel. Externally fitted
,
'
*
,
environments. Medicines or other
systems can bedeveloped.
_
additives may kill bacteria and thus
Should be considered ,
_
_”
reduce efficiency. Çlogs up_ event—_
primary methodWhenüfer
‘
ually if too much mechanical filtra—'
possible.
'
[
tion takes place.
_
_
_
‘
Plant growth Requires deep gravel bed for rooting
Very decorative where :
_
‘
which may encourage
anaerobic
successful. Somemethod
,
«
areas.
Rooted plants do not grow well of urine removal also need’
Î
.in biological “beds. Takes up large
ed in fresh water. Algal
__
proportion of available spa'ce‘in the
gr0wth beneficial
"
,“
"environment.
_
water systems. .
*
Algal
Requires filter tray of large,dimenImpractical in
x
filtration
sions for efficiencyand also complex—situations. Resulting
'
"
Water circulation system.’Efficiency
efficiency‘probably not _
_
also dependent upon available light.“
Worth'all
the trouble. ‘ î-Ÿ_"
_
this system is practical
which the fish do not:eat
the "plants. In many marine thirohments the filtering
'
be carried out equally by means of filter feeding organismS suChas
live corals, tube worms and, so on. This ‘natural’.meth0d is extremely
satisfy'ing When successfully accomplished but'for avariety of
_
is diffiCult to set up.
-
'
»
:
ï
Further methods of dealing" with ammonia_
utilise various items
_
_
'
of specialised equipment, either to “complete the nitrogen‘ cycleor
_
to. make its completion unnecessary by directly removinig
amm0ma
,
Ï from the environment. All types of filters and ' ski}nrher3
this
and are fully discusSed later (p. 45)The1r 1156 and… (
_
reliability depend
‘
on available power supplies'
Of
to…keep_ them operating.