Desirable settled water at room temperature with the addition of potassium permanganate (light pink solution).

In this case, filters are supplied with settled water from the same pipeline or the same channel, without a fall, since no distribution is required.

Watered with settled water or a weak pink solution of potassium permanganate.

The ecological processes are accelerated when sunlight penetrates the settled water.

Watering the bushes is best with settled water and after sunset.

The decanted water is evacuated from the top of the tank.

Disclosed is a fresh water production method which can produce clarified water such as fresh water from non-clarified water such as sea water with high efficiency.

Dewatered solids are dumped external to the tank and clarified water is recovered from the tank.

Sewage is fed (7) into the first tank and the clarified water is withdrawn by suction (8) from the second tank.

the quality of the water to be filtered degenerates suddenly; in this case, the level in the clarified water launder rises fast.