These three coco coir bricks came with no directions in the packaging so I had to look back at the walmart listing to get the amount of water to add. It said for each brick between 4-6 quarts of water, so I added 5 quarts. 5 was too much, and it was very soupy... 3 quarts would have been better. But this is not such a big deal, I can leave this soupy stuff sit out for a few days and the extra water will evaporate off, OR I can mix this in with some dry potting soil I have - which I usually do anyway - I never use this as a stand alone product - always as a mix with soil because it isn't suitable for heavy feeding plants like tomatoes or peppers. I use this as an amendment to improve the soil I have.
It takes a few hours to fully expand once the water is added, be patient. You can help it along by breaking up the brick as it begins to expand - but not necessary. It will do fine without help.
This stuff is a must have for me. I mix 50/50 with potting soil to start my seedlings and I use about 20% coco coir / 80% regular soil in my raised garden beds. It helps my soil retain moisture, and it's just handy to have on hand because it comes so compacted and is easy to store, does not take up much room.