When the blocks are placed in a pot, an air space is created between the blocks, which promotes root growth. Too much water can leave the block itself on 4 sides if you give too much water, it will not matter because the excess water is drained. Less use of algae forms when these blocks are used. After watering, the growcube will contain a mix of 50% water and 50% air. This ensures that the water is well distributed and works as a kind of water buffer.