Indeed, it must be submerged in water, it doesn't draw as the friend mentioned, not even from 30cm. It claims to lift 7m... it barely reaches one meter.

On 24/12/22... I wanted to fill some bottles with oil, it found its place now. I filled a 5-liter one in 20 seconds

with a 30 cm tube at the bottom, it cannot draw water, although it visually appears to be able to accept a suction hose below, in practice it does not have the power to lift the water even 30 cm, the pump itself must be submerged in the reservoir...