As you have understood, the Groasis Waterboxx® and Growboxx® plant cocoon are a part of a planting technology. Its function is to bring the roots 3 meters deep in the first year. After that it has no function anymore. The box contains only 16 liters of water while a big tree maybe evaporates 10 liters per day. Because its roots are over 3 meters deep, the tree takes the water from there and it survives without the box. For this reason we take off the box after one year and plant the next one.
So never mix the idea of planting technology (= GroasisTechnology incl. Waterboxx® and Growboxx® plant cocoon) or irrigation (= giving water while the tree is big).
The advantage of the Growboxx® plant cocoon is that we leave the box and that he creates optimum circumstances even after a year, since the Growboxx® plant cocoon while degrading will keep a bit humidity around the stem and will cool down the soil around the stem