How do I create drainage holes in the substrate mats?

Creating drainage holes

• Create drainage holes in the substrate mats at least 24 hours before planting to allow any excess water to drain from the mat. Ensure that no “dead” water remains at the bottom of the substrate mat, as this will have a negative effect on the development of the roots of the crop.
• The distance between the first dripper and the drainage hole is decisive for the water behaviour in the mat. As the distance increases, the refreshment and re-saturation rates in the substrate mats become higher.
• Drainage holes are made by creating vertical cuts of at least 3 cm, running from the bottom of the mat upward. The best place for drainage holes is between the plants, at the lowest point of the mat towards the slope. Create one drainage hole for every 133 cm of mat length. If the mats are longer, you can opt for one or two drainage holes. This depends on the preference of the grower (when in doubt: it is easier to make additional drainage holes during the crop cycle than having to close up existing drainage holes!).
• Use your fingers to widen the drainage holes, so that they cannot get blocked during the crop cycle.
• A large amount of waste water is released when creating the drainage holes. You can reuse this for the new crop or discharge it via the sewer system. If the drainage system cannot process the large amount of waste water, start making the drainage holes at the lowest point (the wall) first, working your way up to the highest point (the concrete path), step by step. In addition, you can opt not to drain all substrate mats on the same day, but to divide this. This way, you can use the drainage water from the first sections to create the nutrient solution for the next sections.