Yes, hi there, I was in a hurry earlier and didn't mean my comment to be blunt. The rinsing of substrate, best done a bucket at a time with a hose outdoors assuming its not too cold, can be a long drawn out process and over time people figure out how to set the hose pressure such that they can just leave it running unattended for pretty long usually. Substrate can have quite a lot of "dust" in it.
Having the substrate in the tank water is not rinsing it because the dust has nowhere to go (except into the filter where you don't particularly want it.) The suggestion to re-rinse out in a bucket comes from a long line of advice we've all given each other here over the years that some sorts of tank maintenance activities always -seem- worse than they really are. Draining a tank and taking substrate out, for whatever reason, is definately one of those things and its really easier than it first seems.
Anyway, welcome to our beginners section since I didn't have a chance before,
~~waterdrop~~