this purifier works on the basis of heat.

it is bascally 2 tetrahedrons one insde the other.

The base of the internal tetrahedron needs to be silver.

2 sides of the internal tetrahedron need to be silver.

The outer tetrahedron and remaining side of internal must be perfectly clear.

The tops of 2 slver sides of the internal tetrahedrons need to be cut short by same amount the outer tetrahedron is away from internal tetrahedron.

the internal tetrahedron has to be hard up against the outer tetrahedronon the base and clear side.

this allows water in outer tetrahedron to not be heated by the sun again.
 
 
how it works

step 1

place a quantity of water inside internal tetrahedron at high tide usually during the night.

step 2

place tetrahedron so the clear side faces sun at all times.

a turntable that is turned by a stepper motor 180degrees powered by a pv cell would be ideal.

step 3

sun refracts through outer tetrahedron and internal tetrahedron heating water as it passes through to be reflected and reabsorbed by water on way back out also.

step 4

water heats to steam and travels up internal tetrahedron to condense on outer walls of external tetrahedron and pool at the base.

step 5

drain fresh water from external tetrahedron when float switch activated and flush/refill internal tetrahedron.