Welcome, Herwick.
Your pool looks related to my pool

Color change is a good sign. You asked earlier about how long this process takes. In my swamp, it Took about 12 days.
One thing that will expedite your slam in swamp condition is to get as much muck up off the bottom and out with a leaf rake.
Ride your pump/filter in terms of backwashing whenever more than 25% clean pressure, and seriously don't let the FC drop below your slam level for your cya.
In my black water conversion i did dose a good few ppms higher, eg. 16, if I had to be away for a bit and my goal was 12. Any time you drop below the kill zone in these cases, it gets ahead pretty quick...and you'll notice a reversion in color. That said, don't go crazy

Just work it out so you don't drop below at all for your cya, and remember the cya test is only accurate to 10-15 so if you actually dosed higher, you'd need to bump up the FC to the next level or stall (see cya:FC link in my signature.)
You can also partially close the main drain and pull more water from the skimmer...ths helps avoid clogs in the beginning stages.
I'm posting a larger pic of my "12 days of shock and awe" to give you a sense of color change and clarity over time in a "black water slam."
When you are further along than now, you can try a few veeeery slow vacuum to waste sessions if you thing you have most of he larger debris up off the floor. Be prepared to check and clean out your pump basket when you do this and let us know if you know how to do this or need help.
If you notice pressure DROP on the filter gauge, this is a sign you might need to clean the pump basket (eg shut down pump, close valves, loosen pump baket lid, clean basket, which might be full of pine needles etc., fill pump recess back up, wet the o-ring to seal, fill recess with water to help re-prime the pump, tighten lid, the open valves and restart system. It may take a minute or so to prime, so don't panic
You will notice in my pic that though I'd "thought" I got it all, there was still a pile of leaves in the corner
Cheers to clear
PS eventually the frogs will put the word out that the party's over, bu you'll likely still get some swimmers now and then cause I guess there's no place like home
