Hi Dave,
Cheers for the advice. Today (practising on my unsuspecting neighbors; not on my round) I've been using setting No 2. This seems to give a good squirt for the rinse.
I think No 1 just seems to dribble out.
Should I use No 2 for the 'first cleans' by WFP, then revert to No 1 for subsequent cleans? Or is No 1 good enough for a first clean?
Also, the backpack is heavy. After doing three houses, refilling twice, I began to feel the weight; the Geordie softy I am; so I placed it into the trolley I have, (a typical commercial (not DIY - two wheeled)l window cleaning trolley; I had to bend the side bars outward slightly to accommodate it), but a spare 25 litre barrel fits snugly beside it.
So, for the moment I'm going to treat my backpack as a trolley system.
However, I could use the Shurflo pump and battery with the trolley; as it's orgininal purpose intended, but I can't vary the water flow; it's a basic pump that will push the water out at its maximum capacity; and at the moment my water carrying capacity is limited, so the backpack is a good water-saving solution; I think.
Once I get a tow-bar and trailer; therefore enhancing my water carrying capacity; I'll be using the trolley with the backpack; doing all the windows via WFP; but at present I have a few areas where a longer hose would be usefull. For example, houses that are set back on a slope with ten or so steps to reach them.
I'm also concerned about my increased semi-colon usage; I don't know if this is connected to getting a WFP.
Also; congratulations and thank you to anyone who has waded through this post and manages to answer it.