Mapito is the most popular growing medium in holland, excellent results with a new organic element. Mapito comes highly recommended and is one of the best growing mediums out there. Mapito is a substrate blend which uses rockwool and PU flakes (poly urethane). Because of this Mapito contains organic elements which will speed up the start of the grow. It has got a solid structure with an optimum balance of water and oxygen. These qualities will see a top result. Before use one should rinse the Mapito out to lower the current EC value. Also adjust the pH value between 5.5-5.8. Once this has been done you can start with the desired EC value.