If using Coco as the base growing media, it must be washed and buffered for best results. Coco is available pre-washed (soaked) in 80 liter sacks. Then after the containers are filled, a 100% container volume Coco Buffer mixture application (a 10 liter container gets 10 liters of Coco Buffer mixture) can act as a nutrient buffer and can be used to wet the washed Coco based growing media before planting seeds or seedlings. Here’s a link to a technical paper on this topic. https://www.scirp.org/pdf/jacen_2021082515123456.pdf
Once you have planted, then you are ready to ‘Rock & Roll’ with a nutrient and pH management system.