I have to manually fill the pump body with water at the start of the year, but it stays full so that I don't have to prime it afterwards to get it to be able to suck the water up an empty suction line from, say, 5-15' of lift.  It's that lift that I've had a problem with in the past after pumping chemicals with the pump.  Couldn't for the life of me figure why the pump wouldn't suck water anymore until I reprimed it with fresh water.  That happened to me twice before I was sure it was the problem.

 As for the advice, it's a money-back guarantee, eh?  Hehehe...  Oh well, I learned something anyway. Thx.  :)