Hi Folks,
How I read the disclaimer is:
Shurflo are saying that the Backpack is NOT designed for "High level use". So they cannot give the full warranty.
So if, for example, you buy a new Backpack and after a day the pump stops or leaks. I'm sure Shurflo will replace it as it was obviously faulty manufacture.
However, if you, like me, buy a backpack and use it every day 6 - 7 hours a day for WFP then after 8 months the pump looses pressure or leaks then Shurflo cannot replace it as it could be due to wear and tear.
Having said that, I have had a Backpack for 18 months and it's still going OK. Not as quiet as a new one and lost a tiny bit of pressure.
I, from experience, would say you could do with a new pump every year if you use a backpack as I do.
David