In my initial thread on starting to develop film (I'm using FP4 with Ilfosol 3) someone commented that they rinsed for as much as 20 minutes. Ok, I have to confess, by the time I get to the rinse step, I am very eager to get a look at the negatives, so I've never rinsed anywhere near that long. What I've been doing is pop the top off and then run water from the tap into the tank. I'll let it fill and then dump it out maybe 15 or 20 times. I'll set the tank in the bottom of the sink and let it run continuously for a couple of minutes as I tidy up some of the other stuff I had been using. But about then I'll get impatient, so I dump out the water, pour in my PhotoFlo mixture, pop the top back on so I can invert it a couple of times to make sure it coats everywhere, then I dump that out (back into my pre-mixed jug, actually), pull out the negatives, give them a swipe with my sponge squeegee thing, and hang them up. So far, I can't see that anything is missing from rinsing for what is probably a total of five minutes instead of 20, but then again, I haven't printed or scanned any of these yet either. Am I screwing this up? Should I suck it up and rinse longer? What does a 20 minute rinse do that my process does not?