Miscellaneous
8
- 3
8
2. Pack Test
“TH” i
n
dicated
o
n
the tab of
the t
u
be
P
u
ll o
u
t
Remove the
g
ree
n
pla
s
tic
s
tick from the
e
n
d of the t
u
be.
1.
T
u
r
n
the t
u
be with the ope
n
e
n
d poi
n
ted
u
p. The
n
force
the air from the t
u
be by
compre
ss
i
ng
the lower part
of the t
u
be with yo
u
r fi
ng
er
s
.
2.
While keepi
ng
the t
u
be
compre
ss
ed, p
u
t the ope
n
e
n
d i
n
to the water. The
n
loo
s
e
n
yo
u
r fi
ng
er
s
to
su
ck
u
p water to the t
u
be’
s
mid poi
n
t.
3
.
S
hake the t
u
be li
g
htly 5 or 6 time
s
.
Wait
3
0
s
eco
n
d
s
a
n
d determi
n
e
the tap water hard
n
e
ss
by compari
ng
the color of the t
u
be water to the
color chart.
4.
3
0
s
eco
n
d
s
Measuring Method for Pack Test of Tap Water Hardness
How to Measure
Measuring Method
1. Remove the green plastic stick from the end of the tube.
2. Turn the tube with the open end pointed up. Then force the air from the tube by compressing the tube’s bottom
part with your fingers.
3. While compressing the tube, stick the open end into the water. Then loosen your fingers and allow the water to
be sucked about half way into the tube.
4. Shake the tube lightly 5 or 6 times. Then determine the water hardness level by comparing it to the standard
color chart.
5. If the value of the tap water color exceeds a hardness level of max. 200 ppm referring to the standard color
chart, measure again using the following method.
Measurement Method for Tap Water with Total Hardness Level Exceeding 200 ppm
Necessary items
G
Ion interchange water or distilled water (such as
cleaning solution (sterile water) for contact lens)
G
Supplied package (approx. 4 ml) for pack test of
chlorine ions
G
Pack test for total hardness (WAK-TH)
Measuring Method
1. Pour in approx. 4 ml of tap water until the mid line is reached in the test pack.
2. Add the ion interchange water (or distilled water) to the test pack (approx. 4 ml) adding to the tap water until
the test pack is full. Pay attention to not let the liquid overflow. The test sample will then be a mix of 1/2 ion
exchange water (or distilled water) and 1/2 tap water.
3. Follow the same procedure for the measurement of hardness as described above.
4. Compare the resulting color with the standard color chart. Doubling the value of the standard value as shown
on the standard color chart gives you the value of the tap water hardness level.
Caution After the Test
G
Dispose of the remaining 1/2 quantity of sample water.
G
Do not dispose of the used tube in the field after the pack test. Bring it back for separation and disposal as a
burnable item following standard garbage treatment separation procedures.
How to Verify the Color and Read the Measurement
Compare the color of the water inside the tube with the standard color chart after waiting the specified time. The
value of the nearest color is considered the measured value of the tap water.
In case of an intermediate color between two color standards, estimate the intermediate value of the color shade.
S
terile
water
Mid li
n
e
Chlori
n
e io
ns
te
s
t pack
Clea
n
i
ng
s
ol
u
tio
n
for co
n
tact le
ns
(
s
terile water)
Approx.
4 ml
Pack te
s
t
Air e
s
cape hole
Force o
u
t the air to extract the liq
u
id
Extracted water
s
ample
Mid li
n
e
Io
n
i
n
tercha
ng
e
wa
ter
Fill f
u
ll of water.
Pay atte
n
tio
n
n
ot let it overflow.
1/2
s
ample tap water
07-032 VW-VF10BG_TD 2/15/07 11:25 AM Page 3
