An empty 1.5 liters plastic soda bottle turned up-side-down
is used. The brass or copper inlet pipe and the plastic tubing attached
to it at the bottom have a dia of 10 mm. Make sure that you bore the inlet
hole in the strengthened part of the bottom and that the bore hole is turned
to the right as much as possible in order to get a tangential inlet of
the water.
 For
the outlet bore a 10 mm hole in the screw cap and have a short (4-5) cm
brass or copper pipe fit into it. Use glue on both sides of the cap. Put
on a few centimeters of plastic tubing.
At the centre of the bottom bore a small hole for a screw or hook so you can hang the contraption from a suitable support. Dont forget to bore a ca 2mm hole at the bottom in order to let the air out when you start filling the centripete. Hang the centripete at a suitable place, attach the
inlet tubing to the tap, screw on the cap, turn on the water and you will
soon se a beautiful vortex. Adjust the level to stay just under the inlet.
Be careful, it is easy to get wet.
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