My wife is going to start working with me 2 days a week, so as a quick temporary solution i have opened up an old backpack and just extended the pump inlet tube and dropped it straight into the tank, and connected to a hose reel for my wife to work off. It works perfectly, which got me thinking...is it really worth spending the extra money on expansive pumps, flow controllers etc, when i could just use backpacks. I appreciate they wont last as long, but £100.00 for a new one with delivery when needed aint too bad. Could work out a lot cheaper. Does anyone else do this?