DelAgua OXFAM-DELAGUA, User Manual

Page: 39 / 67

OXFAM-DELAGUA Water Testing Kit — Users Manual
38
Note: The plastic collar has 3 adjustment positions:
1. Completely free - the apparatus can be dismantled
when in this position.
2. Loose but not free - all interior surfaces are
exposed to the atmosphere. This is the position
used when sterilising the apparatus.
3. Fully tightened - the funnel forms a tight seal
between the membrane support and the membrane
filter. This is the position for filtration.
10.
Rinse the sterile sample cup once with the water before taking the sample.
Take care not to allow external contamination (eg. dirt and debris) to enter the
sample cup.
11. Pour the sample into the filtration
funnel up to the appropriate mark
(10, 50 or 100ml) engraved on the
internal surface of the funnel. To
avoid damaging the membrane, tilt
the filtration apparatus and carefully
pour the first few millilitres of water
down the inside of the filter funnel.
Return the filtration apparatus to the
Upright position and continue adding
the sample. Take care not to allow
external debris to enter the funnel.
Pour the sample into the filtration funnel