I have cleaned a through lounge diner at £60, got a £10 tip on top, took 1hr. 35 from pulling up to pulling off. Then I have cleaned a small 2 bed ground floor flat. Empty, and had to be sanitised aswell due to previous tennant having a dog. I charged £200 for this, took 2.5 hrs and that indluded 1 hour vacuuming alone. This evening I have fitted battery to other truckmount and have given it a test run before it goes out on road. All seemed fine but have got bubbles in flow meter when drop rate to below 4. Above 4 and no bubbles. Anyone got any ideas?