I have tried a whole lot of coco. I think brand barely matters. Flush it real good and the cheap stuff in bricks is fine. There are greater improvements to be made elsewhere in your grow. Adding perlite, going for a more chunky or spending more money does not add a great deal in yeild or quality from my experience. Others my disagree. If you are not growing in an ultra small container, it's a variable I personally would not stress too much about. There are a lot of more interesting things to worry about. I feel it is more a matter of preference than performance. Could be totally wrong also
That’s actually not true. Bricks of coco can harbor dormant fungus gnats and I’m sure other pests. I had a brick that whenever I would break some off and use it I would get an outbreak of fungus gnats within a week of hydrating it. Couldn’t figure out where they were coming from until I stumbled upon a thread that discussed this very issue. So I did what the person did and hydrated some and left it sealed in a bucket for about a week. When I popped the lid off there were a handful that flew out the second I opened it and another 20-30 crawling around inside the bucket.
But the good thing about bricks of coco is that you control how they get hydrated and what they get charged with. So now I hydrate with boiling water and leaving it sit until it cools and then refill with boiling water and let sit again. Then I flush until it’s to my liking and then charge how I like to so I know exactly what I’m starting with.
I guess you could do the same with bagged coco but it just seems a waste since your paying more for not having to go through the hassle of hydrating and charging.