CANNA SUBSTRA is the best nutrition for growing on inert substrates such as rock wool. It is used especially on 'run-to-waste' systems; these are systems where the drain water is drained off or so called open-hydroponics systems.
If you grow on a run-to-waste system, you need a plant nutrient that exactly suits the needs of this special growing method. The substrates used in run-to-waste are mostly inert (which means they don't add or take nutrient elements from the nutrient solution). So all the nutrients have to be in the nutrient solution.
An excess of nutritional elements can lead to plant damage but they will also end up in the environment.
CANNA SUBSTRA has a balanced quantity of all nutritional elements needed by plants.
Hard and soft water versions
Not only should a nutrient be specially designed for inert run-to-waste systems, it should also match your type of tap water. That’s why CANNA developed a hard and soft water version of the SUBSTRA nutrient line. With this choice, the correct amount of nutrients will be delivered to the plants root system and as little as possible nutrients will end up in the drain water; healthy for the consumer and great for the environment.