narvin - I did all that for years:
BK: whole hop/bazooka - very little material made its way through.
1/2 hour recirc every time with hot PBW followed by a rinse, followed by a 90 minute bake at 250df.
but I'm telling you that if you take a white bucket and back flush both sides with the output going into that bucket you can do it for HOURS and still see little specks of hop particulate come out. turn the hose on full blast to loosen it and then turn it off. repeat. you will see junk come out. if you let it run you will only see it at first as the stuff becomes trapped in the bends, but if you hit it with high pressure, you'll see what I mean.
again, I used a plate chiller for a 4-5 years and never had an infection. but all that cleaning, setup, sanitizing etc. became too much of a hassle for me. I'm done with my brew day at exactly the same time I was before - sure it takes me longer to get down to pitch temps with an IC and ice water recic (after <100df), but I don't spend all this time recircing cleaner, rinsing, disassembling the pump, hoses, plate chiller etc.
Spray off the IC and its done.
When I saw how much garbage was still in my plate chiller when I thought it was 'squeaky clean', well, I lost it a little bit.
I don't have as cool of groundwater as you guys do either, so they require a lot more extras to make em work properly.
By all means, whatever works for you, do it! But beware that it ain't as clean as you think it is