The coco bricks are ideal for indoor or out door gardening. CocoTek is pH balanced, and contains the lowest known sodium content for coir fibre. It increases water hold ing capacity and nutrient retention, expanding to 5 times its condensed brick size (1 brick ex pands to 3-1/2 gallons). CocoTek can be mixed with any other growing media (Perlite, Grow Rocks, soil, etc.) to make the desired final mixture. The mixed brick has larger particulates than the standard coconut brick. The mixed brick contains coconut chips, fiber & fine coir to increase the structure of the media.