The 9" mentioned seemed to refer =not to the washer 'jump' but to it's reach into the body! Correct me if I am mistaken. (Yes it is an MPG5 -got mine from Elixa.
I am just sure that the initial impact of the MP has lessened, but will keep using it specially around the 'northern areas' if you see what I mean. What I picked up on was that when the 'hit' is less, it may even encourage pathogens, not destroy them!
Thank you all kindly for your input and experiences. It's all helpful.