>use an old weak sumbersive pump (250W or less)
>we really need to water the grass because of this hot summer
>get one of these (some really noname shit, 750W or so)
>no flow basically at all
>go back, get this one (1200W)
>same
I mean this supposed to make a fucking fountain.
It does basically nothing at all.
No leaks anywhere, looks fine, no water leaks, no sounds of air getting into it.
Two pumps, same problem.

What do we do wrong?