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MajorAquælumSystems
and good
have been-‘ established,thebiologicalsystemls
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-—pïobàbly either
ïor non—existent for= someIeason,pos51bly
resultdfflôW air*ow,’ and-the
is, in fact almost
as a natural «system.
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In
the”anir‘nalî population burrowswin—to‘ or lives inthe
graVel bed the system
be unsuccessful because the continuäïl
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opens up fast—flow channels which bypass the
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like; sheS may become trapped and :‘die —beneath'»the -— filter plate if it
not seal€d at the edges, or may find their way down the lift tubes
if the
hot have a“mesh cap
roi“ similar device.
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The Sterile System
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In this system, developed mainly forthe kèepingÿof expehsive and
delicate marine specimens,
creatureS present in the enviro_nj
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are
those for .whom it is designed. There
secondary
animals nor any other biological lifeforms, and
functions are carried out by ancillary equipment—= and the
of
stringerit cleaning methods. Because urine presents
a ÊÏQ7
blem this method is more easily applicable to the
ment., but even then it is probably only the high cost of some marine
:
much to the problem
«cry technical and are
î complex equipment,
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