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Een Druppeltje Hoop - Follow Up

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Optional: Download English BioSand Filter PowerPoint - ' Follow up '

Follow-Up with the User - When to do visits (suggested):

•  1 week after installation

•  1 month after installation

•  3 to 6 months after installation

•  1 year after installation

Things to check during a follow-up visit:

When you visit a user, there are many things to check. Use a monitoring form for follow-up visits. Ask the user questions such as the examples listed below. Record the answers on the form.

1•  "How often do you pour water into the filter?"

Users should:

•  Pour water into the filter at least once every day

•  After the filter stops running wait at least 1 hour before pouring in more water.



2. "Where do you get the water to pour into the filter?  

Users should:

•  Use the same source of water every day.

3. "Can you show me the water you pour into the filter?"

Users should:

•  Pour clear water into the filter (or mostly clear)

•  If the water is too dirty, let it sit a bucket until the dirt settles to the bottom. Then pour the clear water into the filter. This will make sure the filter doesn't clog quickly.

6. "May I take out the diffuser to see the sand?"

•  The surface of the sand should be flat and level

•  If there are small holes or dents in the sand, look at the diffuser to see if it has cracks or if it does not fit tightly in the top of the filter

•  If there are big holes and valleys in the sand, ask the user if they sometimes pour water into the filter without the diffuser. Remind them to always keep the diffuser in the filter.

8. Can we fill the filter to check the flow rate?"

•  The flow rate should be 340 mls per minute or less

•  If you are filling a 1 L bottle, it should take 2 minutes 54 seconds or longer to fill

•  If you are using a 500 ml bottle, it should take 1 minute 27 seconds or longer to fill


If the flow rate is very slow, ask the user:

•  "Was the flow rate faster when the filter was first installed, or has it always been this slow?"

•  "Have you ever done a Swirl and Dump?"

•  Ask them to show you how to do a Swirl and Dump.

Show them again if they do not remember. Explain that this will help the flow rate become fast again.

9. "Do you clean the filter? How do you clean it?"

Users should:

•  Wash the diffuser and lid in soapy water and keep the outside of the filter clean

•  Wipe the outlet tube with a clean cloth and chlorine

10. "Has the flow rate ever become too slow? What did you do?" (only ask this if you did not ask them before.)

Users should:

•  Do a Swirl and Dump on the top of the sand

"Can you show me how to do a Swirl and Dump?"

•  Add water, take out the diffuser and swirl their hand around, flat on the sand. Then scoop and dump out the dirty water in the top of the filter.

11. "What containers do you use to collect water from the source? Can you show me? Can you also show me what containers you store your filtered water in?"

Users should:

•  Use one container to pour dirty water into the filter, and a DIFFERENT container to collect the filtered water at the outlet

•  Use a safe storage container to catch the filtered water

•  Store drinking water covered with a lid to keep dirt and insects out

12. "Do you do anything to the filtered water before you drink it?"

Users should:

•  Disinfect the filtered water, such as by using chlorine, or boiling water.

If the users add chlorine, ask them where they put the chlorine.

Users should:

•  Put the chlorine in the safe storage container only. They should NEVER put chlorine in the top of the filter.

13. "Do you clean your water container?

How do you clean it?"

Users should:

•  Wash the inside of the safe storage container with soap and treated water

•  If chlorine is available, they should add chlorine to the water and let it sit for 30 minutes

•  Wipe the tap with a clean cloth and chlorine

Download English Handout #15 - Follow-Up with the User


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