I use a WCW backpack everyday. very easy to use and much less complicated than the shurflo backpack.
I picked up a spare battery too from a shop that sells motability scooters (£20) I put mine on charge every night and is fully charged by morning, lasts all day no prob, sure they stated somewhere the charge lasts about 10 hours.
Have personally used it up to 35ft with no loss of flow.
I can do maximum 3, 2 bed houses on 1 full to the brim tank.
Hope that has helped mate. Any other questions...ask away.
