So the bricks I do rinse just in tap water....
canna coco. I haven't soaked or ph'ed mine and no issues.
I expand then rinse under the faucet about 120ppm and 7.1 ph. Says you don't have to but I find the bricks to have some dust and I want a night light fluffy coco free of sediment that improves breathability. The already expanded
canna coco is just dump and use. Both are certified pest free and quality. I will never bother with another as coco is not created equal.
Then fill containers and mix my nutrient solution and run my ph adjusted nutrients through the media at 1x pot volume. For me that's 1 gal. At the end of that my ppm is and ph are pretty much bang on the input ppm and ph.
A quality coco is important and you can't go wrong with
canna coco imo.