Big letdown

The water works was delivered quickly. So equal unpacked and connected all the pipes. In the box were several empty plastic bags which suggests that the box has been opened before.
The manufacturer requires a separate letter was in it was pointed out that it often causes problems during startup, so a total of 4 x refilled water. And the device then pumped water really. but far from the stated amount and the pressure? Which pressure was virtually non-existent. since my no name has promoted for 80 more water and the pressure was so miserable, because not even running a lawn sprinkler.
Taug nothing return request to Tool Trade.