The wife's not so happy about having perlite about again, but I'm getting No4, the big stuff. Won't be a problem, right?
I feel that the big #4 perlite is too big. I think the spaces between the chunks are too big to wick water efficiently and that the smaller perlite gives just the right air spaces between the bits to allow for better water motility. I found that the bigger chunky stuff is great when mixed about 1/2 and 1/2 with the small stuff to fill in the gaps between the big chunks.
2 cents delivered.