4. Forth Stage
The quantity of water that is needed for a growbag to expand is about 70% of its final volume. For example, the quantity needed to expand 18 liters growbag (100x15x12) is about 12 liters.
5. Fifth Stage
During the expansion, it is very important to apply a calcium nitrate treatment. To every expanded cubic meter [1000 liters] of coir, 3 kg of calcium nitrate must be applied.
For example: 55 growbags of 18 liters each comprise a cubic meter of expanded coir. The easiest way to apply the calcium nitrate is with the water
used for expansion. For example the quantities for 55 growbags of 18 liters are: 660 liters of water and 3 kg of calcium nitrate.
It is recommended to apply this treatment in a few irrigation cycles. After the full treatment (after completion of the few irrigation cycles) is given the material should be suspended for 48 hours.
6. Sixth Stage
After 48 hours, drainage holes must be made. The holes must be made on both sides of the growbag, on the corner between the side and the bottom of the grow bag (On the edge of the growbag). Each hole must be 6-8 cm long. In total there should be at least four draining holes.
It is also possible to purchase the growbags with planting holes and drainage holes. In such a case the only change is that, the calcium nitrate treatment should be applied by smaller portions of water and more cycles.
7. Seventh Stage
The growbags must be washed by clean tap water. The washing will reduce the E.C. level of the drainage water to the level of the tap water. This procedure may take time and water, but is crucial for the growth of the plant.
8. Eight Stage
During or after washing, planting holes should be made and the arrow drippers should be reinserted into the growbag.