Plagron Cocos Perlite 70/30 50 LitresPlagron Cocos Perlite Incredible Aeration and Drainage This 70 30 mix gives you all of the benefits of Plagron Cocos Premium, but with an added 30% dose of perlite. Perlite is a porous, volcanic rock that is often used in horticulture to improve drainage, aeration, and water holding capacity. Perlite helps to create a more open, well draining growing medium that is less prone to compaction and waterlogging. This can be highly beneficial for plants, as