Hey Reb, when those bricks refer to expanding in size, it's because they're compressed into brick form and dried to retain the shape. To expand them, you pour or spray water over them. It takes a couple of minutes to expand and then you have your coco fiber to put in your grow bags or whatever container you want to use. Have you ever seen those little Jiffy peat pucks that expand to start seeds in? It's like that only bigger.
im no expert on coco but i hope this helps :thumbs:
im no expert on coco but i hope this helps :thumbs: