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]
Place the Filter Media
1. Ensure that the drain hole (the outlet pipe opening at the bottom inside of the filter) is clear and
unobstructed (that it is not covered by concrete and is not plugged by any debris.) The flow rate
through the tubing without any media in the filter should be 2.5 l/minute).
This step should have been done when the filter was removed from the mold, however, double
check now before you get too far into the installation.
2. Ensure that the inside of the filter has been cleaned out (including dirt, dust, and oil from the mold).
3. Fill the filter half full of water.
4. Pour in the big stones (12 mm).
5. Pour in the small stones (6 mm).
6. After that quickly pour in the sand (0.7) to the filter (ensuring that there is always water above the
surface of the sand).
The media must always be added with water already in the filter to prevent pockets of air from
being trapped within the media. Ensure that the gravel covers the drain hole near the bottom
of the filter.
7. Fill the filter with water and let it run until water stops pouring out of the outlet pipe. When this
happens the water level is equalized.
8. Swirl the top layer of sand and dump out the muddy water to prevent the sand from clogging.
9. Smooth out the surface of the sand so that it’s as level as possible.
Flush the Filter
1. Place the diffuser plate on the ledge inside the filter.
2. Place a receiving container under the spout.
3. Pour the cleanest available water into the filter.
4. Observe the water coming out of the outlet pipe.
5. Continue adding water to the filter until the water coming out is clear. This may take 40 - 80 liters or
1 to 2 days.
Test the Flow rate
1. Fill the filter to the top with water.
2. Place your measuring container under the spout to collect the outlet water.
3. Measure the time it takes to fill the receiving container in one minute. The flow rate should be at a
maximum of 0.6 L/minute.
The flow rate through the filter decreases as the height of the water in the reservoir drops. As
the water level reaches the diffuser, treated water may only drip out of the filter spout. It can
take 4\0
– 90 minutes for the 20 liters in the reservoir to completely pass through the filter.
Disinfect the spout
1. Place the hose over the filter spout.
2. Clamp the hose in place with the hose clamp or a tape.
3. Place the funnel on the other end of the hose.
4. Hold the funnel higher than the top of the filter, and pour 1 liter of chlorine solution into the funnel.
5. Hold in place for 2 minutes.
6. Remove the hose and drain the chlorine solution
7. Wipe the outside of the spout with a clean, chlorine-soaked cloth.
8. Add 20 liters of water to the top of the filter and wait 30 minutes to flush the chlorine out.
9. Place the lid on the filter.
