Our Quality Department monitors our products to ensure that they meet the highest quality standards. They have access to a laboratory at all of our production facilities. The physical and chemical characteristics of the raw materials are checked in our own and in external laboratories throughout the production chain, from extraction to delivery. The final products undergo several checks before delivery, which enables us to guarantee the high quality of our products.

Our quality management system is certified according to the ISO 9001:2015 standards. We use RHP-approved raw materials for our products. RHP certification guarantees that the substrate meets the right quality requirements for aspects such as water and air content, pH and EC. Several of our coco products are also OMRI Listed®. They include, for example, Coco Crunch, Forteco Profit and Power and the Propagation Cubes. Our Obturo® plugs have been awarded the highest OK Biobased rating of four stars from certification body TÜV Austria.You can view our certificates below.

Van der Knaap uses cookies to ensure that we give you the best experience on our website. Cookies shall be used only for functional and analytical purposes. If you continue without changing your settings, we'll assume that you are happy to receive all cookies from this website. Please read our privacy statement for more information.