I want to replace a noisy ST Monsoon 3 bar pump, and am looking at one of the newer centrifugal pumps. Either a Salamander "Right" pump like the RHP75, or a Techflow QT-2 pump like the QT-80. Does anyone have experience of both these ranges, and which one is quieter? I have a Rexon "whisper-quiet" circular saw that generates around 100db (how do these marketing people get away with it), so suspect Techflow's "whisper quiet" pump is only that quiet when you are wearing ear defenders. Can anyone comment on the relative noise of these two specific models? And is there anything quieter at the 2.5 bar level? Thanks.