The use of a positive pump when it was clear it needed a negative pump was required ( both by verbal directions and the fact there was a low input pressure of water) has caused issues ( pump does not always work first time and other non related water taps operate the pump when not applicable) I got it wrong in the pump pressure from poor advice. However the politeness, professionalness and cleanliness was a big positive. Should have advised me that a 3 bar pump was required . Paid the full price although believe there were errors on both sides