Techniques
are
available
by
which
the
presence
of
these
specific
groups
can
be
easily
identified.
The
routine
bacteriological
examination
consists
of
(i)
plate
count
to
determine
the
number
of
bacteria
present,
and
(ii)
biochemical
tests
to
reveal
the
presence
of
coliform
bacteria.
A
general
laboratory
testing
scheme
for
detection
of
coliform
group
of
bacteria
in
water.
A
variety
of
other
bacteria
and
organisms
which
may
not
be
serious
pathogens
including
faecal
streptococci,
slime
forming
bacteria,
sulphur
bacteria,
algae
etc.
may
also
cause
problems
of
odour,
color
and
taste
and
it
is
essential
that
these
be
eliminated
from
the
drinking
water.
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