i have a 1000 ltr tank in trailer that i fill with a standpipe, this lasts about an hour if customer has a outside tap then i use this but the tap pressure doesnt always keep up with the pressure washer so i have to resort back to a standpipe. We have a licence to use the stanpipes and you get charged for the water used, a standpipe fills a 1000 ltr tank in just a few minutes using a 1 inch tap