wow lots to think of there thanx for all the replies i will be posting all sorts of topics now ,anyway first off ,,my system is actually an e500 not 650 , it has a analouge variable pump control ,and i was told it will run for 8 hours ,so no matter how many precutions i take to save water surely if 2 of us are working we will still only clean for 4 hours max ,i was hoping for some advice on actually carrying more water on van ,someone said to maybe take a couple of barrels and fill up as i clean ,but not sure of that ,,oh and i did say mine was a 650 but checked details and i only went for the e500 anyway sorry to go on ,remember i am a newbie after all thanx everyone you will soon be sick of all my questions so im gonna enjoy it while i can