How to Build a BioSand Filter

Assembling the filter
First add the tube that will bring the water form the bottom of the filter back up to the spout at the top. The tube has holes in the ring to allow water to enter. Connect the top of the tube to the fitting for the spout at the top. 

Next add the rock layer. Add 2 inches of washed gravel. Ensure the circle of tubing is completely covered.

Next add a barrier layer (feed bag with a hole for the plastic tubing).
Put the barrier over the rocks.

Add approximately 2 inches of small pea gravel.
Make sure the barrier level is covered on the bottom.

Add a second barrier layer.

Fill with sand. Fill just below the connection for the “Faucet”

Add a diffuser.

Now you are ready to fill with water.

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