The SpeedStir is more accurate then hand 'swirl'That's how it was performed but using the lovely speedstir. I'll try again this weekend some time.
You are at the stage you can add DE if you aren't already! (I think you have a Sand filter)Hard to make out but that's the drain at the bottom I haven't seen in awhile. There is still filtering to be done but hopefully I can chum the water up enough to get it the rest of the way done.