Rain Tree Foundation
Thai Care e.V.
31 Moo 13, Thumbon Tawangtan,
Schwaneburger Strasse 23
Amper Saraphi. Chiang Mai 50140, Thailand
Friesoythe 26169, Germany
www.raintree-foundation.org
www.thaicare.de
Email: [email protected]
Thai Care e.V.
Schwaneburger Strasse 23
Friesoythe 26169, Germany
www.thaicare.de
Email: [email protected]
To clean the storage container:
•
Wash your hands before cleaning the container
•
Scrub the inside of the container with soap and treated water
•
Empty the soapy water through the tap
•
Rinse the container with a little treated water
•
Add chlorine to water in the storage container
– let it sit for 30 minutes – if chlorine is
not available, let the container air dry.
•
Empty the remaining water through the tap
•
Clean the tap with a clean cloth and chlorine solution (such as bleach)
•
The entire filter should be
cleaned regularly
(lid, diffuser, outside surfaces).
Swirl & Dump:
The flow rate through the filter will slow down over time as the bio layer develops and sediment is
trapped in the upper layer of the sand. Users will know when the “swirl & dump” is required because
the
flow rate will drop
to an unacceptable level. The filter is still effectively treating the water at this
point; however the length of time that it takes to get a bucket of water may become too long and be
inconvenient for the user. Alternately, you can measure the flow rate and if it is less than 0.1 L/minute,
“swirl & dump”
maintenance is required.
1. Remove the lid of the filter.
2. Add 4 liters of water to the top of the filter.
3. Remove the diffuser.
4. “Swirl” a small wooden stick or spoon around in the standing water at least 5 times – the water will
become dirty. Work the stick into the sand layer about 2 cm while “swirling” around across the entire
surface area of the sand, but do not mix the surface layer any deeper than 5 cm into the filter.
5. Scoop out the dirty water with a small container (a cup or a pop bottle cut in half).
6. Dump the dirty water outside the house in an appropriate location, such as a soak pit or garden
(remember it is contaminated water).
7. Smooth and level the sand surface.
8. Replace the diffuser.
9. Pour 20 liters of water into the top of the filter.
10. Measure the flow rate.
11. If the flow rate is less than 0.6 L/minute, repeat steps 1 through 10 until the flow rate are
acceptable.
12. Wash your hands with soap and clean water - you have been handling contaminated water.
FIRST INSTALLATION
Never pour chlorinated water into the BioSand Filter
Positioning the filter
It is important to determine a good location for the filter. Locating the filter inside the home is important
not only for filter effectiveness, but also for the convenience of the user. If you can access the filter
easily, it will be more likely to use and maintain it. Once filled with media, the filter should
not
be
moved.
The filter should be placed:
• In a protected location away from sunlight, wind, rain, animals, and children.
• Preferably inside the home on level ground where it will be used and maintained easily.
• So that water can easily be poured in the top.
• Where there’s adequate room for hauling and pouring pails of water into the filter, and storing the
filtered water.
