Fresh Water Treatment, Medical
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LLOYD.APOTHEKE
6"tt"u. Volbehr+
Klaus-PVotbehr
rzO
.f"lrln
(0471)94607-0
B0rgermeister-Smidt-StraBe
.
Tetefax
(0471)94607-13
.27568
Bremernaven
lnstructions for
disinfection of
drinkingvvaterand drinkingwater
-
tanks on
board ships
Accordingto size
of tankand
degree
of pollution,
the disinfecting-soluiion
(either
HTHor
Clorina)is
pre_
pared
as follows:
a)
Clorina:
Fill
the
prescribed
andexac
y
measuredamount
of Clorina-powder
in a
plasticpail
andcoverwithwater.Stir
witha stick
until
powder
hasdissolved
andsolution
ls
qleaI.
b) HTH:
As above,the exactly
measuredamount of HTH-powder
is coveredwith water (preferably
40" C), Unlike
Clorina-powder
(seea)
),
stirringwillnot yield
a clearsolution
jmmediately.
Afterstiriing,wait for the undissol-
ved
parts
to settle.
Then,only use the
q!9g1
solution.
Carefullypour
solutioninto tank. The
-tank
Should
not be
completelyempty,so that
a
weakened
solutionis
guaranleeo.
Nowfilltankcompletely.
Foramounts
of
powder
and further
instructions
see
paragraphs
lto lll.
Paragraphs:
I
lf drinking-water
of uncedainquality
had to be accepted
as drinking-water,
it is
advisableto add 2
gr
ot
Clorinaor 0,5
gr
of HTHper
m3 of water.
[fhis
smallquantity
of chlorine
willnot affectthe
quality
of water
as
drinkingwater.)
Thewater
can now be usedas drinkingwater,
but onlyafter1Ohours
or lmmediatelyafterbeing
Dolleoitlr
a strong
pollutlon
is suspected
and instructions
in
paragraphs
ll
and lll cannotbe carriedout,allwater
used as drinkingwater
or in preparation
of food must be
boiled.
ll ln caseof
bacterial
pollution
(colony-counts
over 100
at 36', over 1000
at
20" per
ml and/or0
-
3 E. coli bac-
teriaper
100ml and/orcoliform
bacteria
per
100ml),
a disinfectionof the tank with 20 gr
of Clorinaor 5
gr
of
HTHper
maof wateris sufficient.
Pour
thedisinfecting
soiutionintotank,the
tank mustthen be completely
filledwiththe drinkingwater-
Openall
the tapsto ensurethat
disinfectingsolutionreaches
and flows
throughall
pipes
and taps.
Closetaps.
After l0 hoursopen
allthe taps and
emptythe tankcompletely.
Afterthis procedurthe tank
can be filledwith
drinkingwater
and used.Incase
Clorinais used,theemptying
of thetankis not necessary
sinceClorinawillnot
atfectthequality
of the water.
lll In case
of
n0@1vc
pollution(more
than 3 E. coli bacteriaper
100 ml) or after anyone
has enteredthe tank,
fol-
low stepsA to
F:
A. Emptytank,remove
allresidueand
rinsethoroughly.
B. Scrubwalls
of the tankwith
a 2,s
yo
clorinaor 1,s
yo
HTHsolution.lf needed,
preserve.
C. Refill
tankwithwater
and add 100gr Clorina
or 50
gr
of HTH
per
m:
of water.Be sure,that the
tank is filled
to the brim
and no airremains
inside.
D. Thissolution
shouldbe leftto
act intankand pipes
for at least10 hours.
E. Emptytank
by opening
all
taps.Rinse
bothtanks
and
pipes
thoroughly
with a sufficientamount
of drinking-
water.
F. Remove
rinsingwater
and filltankwjth
elean
drinkingwater.
In caseof existing
connections
with othertanks,all
connecting
pipes
should
be disinfectedtoo. In orderto
avoidnew infectlons,
do not entertank.
Remark:
In case no
bacterial
pollution
can be observed
after having entereda tank, it
is sufftclentto execute
steos C to
F
In caseof emergency
and onlyas
an exception,
a
Ircgh
natrium-hypochlorite-solution
can be used.
Dosage: paragraph
ll
: 20
grlm3
of
water
paragraph
lll b
: hypochlorite_solution
/ water
=
1:5
paragraph
lll
c : 200
grlm3
of water
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