Autopot recomoneds a 50/50 medium mix of a medium and something like perlite or clay balls etc.
I’m running a 2v2 clone test in a grow. Journal. Over here
I will. Summerize the results there and here eventually.
However I turned the system on a bit early for the clones as they were big but hadn’t grown enough roots. So things are gojng a bit slow as of right now.
Biobizz claims that the coco is already buffered to a neutral PH. As far as the perlite no I haven’t rinsed it. I mix the pearlite with the coco at about 70-30 coco/perlite and layer the bottom of the pot with about 1-1/2" of just perlite.