depends on the kind of coco you get, if you buy bagged coco its ready to use, if you buy bricks or any other non branded coco you will need to do some soaking with calmag or hard well water to leach out salts before using, otherwise you will have issues. you can do one pot at a time or you can fill a tote from home depot and make a big batch, you need to soak for 24, then remove that water and add fresh water and calmag, after another 24 hours discard the water and let it drain for a few hours, move it around to make sure its moist but aerated and then its ready to use, if you store the left over coco its good to open the container every few days and make sure water its not accumulating inside, you can leave open the container or leave the coco to dry if you want