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How to make a good water filter

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Presentation on theme: "How to make a good water filter"— Presentation transcript:

1 How to make a good water filter

2 End Product Dirty water in Clean water out

3 Material needed One large vessel, at least 32 inches tall
This will be the biological filter One small bucket This will be the water supplying source One plastic pipe Stones of various sizes (see slides) Material to make things water-tight

4 Schematics of the water filter
Water reservoir (with dirty water) Water fit for drinking Slow sand water filter

5 Step 1: Prepare vessel Vessel must be at least 32 inches tall
Make a hole at (about) 12 inches from the top

6 Step 2: Find sand/stones for the filter
Buy/find stones/sand of various sizes You will need a lot of very fine sand (check Home Depot !) Small amount of these Small amount of these A lot of these Small amount of these Small amount of these

7 Step 3: Wash sand and stones
It does not matter if the water is not clean, just wash them to get rid of mud that will clog the filter

8 Step 4: Fix the draining pipe
Use a longer pipe if you have a taller vessel – the taller the vessel the better the filter Make sure the pipe reaches to the bottom Make sure the hole does not leak !!!


10 Step 5: Add sand The filter is ready ! Finally, put in the sand
Left 5 inch space between the sand and the hole (where the pipe is protruding) The 5 inch space is used to maintain water level for the beneficial bacteria which are aquatic ! The filter is ready !

11 Step 6: Make water reservior
Use (another) small vessel (bucket) as water reservoir to supply dirty water to filter Hole

12 Step 7: Finishing up… Fasten the water reservoir on top of the filter vessel It is important that the sand inside the filter vessel not be disturbed after the filter is in production

13 How to use the water filter
You need to run the filter for 3 weeks before drinking the water The beneficial microbes need 3 weeks to multiply and for a layer on the sand The microbes live on the top 2 inches of sand

14 Maintaining the filter
After prolonged usage, the efficiency of the filter will decrease (the output flow will slow down) Remove 2 inches of sand from the top, wash it and put it back Let the filter run 3 weeks before using the water for drinking !

15 Final advice Make 2 filters – in case you need to wash the sand of one of the filter, you can use the other one Have separate containers to store dirty and clean water – never use a container that held dirty water to store clean water Make a pre-filter to filter the dirty before feeding the water to the biological filter

16 How to make a pre-filter
Use a 2 liter coke bottle Cut the bottom out Turn it upside down Prop the spout with 5 or 6 cotton balls Fill the coke bottle with fine sand Pre-filter is now ready for use – pour dirty water from top Wash the sand occasionally and replace cotton

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