While abroad hydroponic cultivation method is not new, in Greece the percentage of greenhouses cultivated with hydroponic methods is too small. However, due to modern requirements for safe and quality products, more and more Greek producers are driven to hydroponic cultivation. The ALAGRO company acting as a helper in this transitional period, organizes or participates in training seminars for people interested in hydroponics. Simultaneously, we have crews and equipment for direct, correct and economic transformation of a conventional greenhouse unit in hydroponics. It is worth noting that ALAGRO company, in an effort for further reduce of the cost for converting conventional greenhouses in hydroponic, offers free guidance to her customers, in order for them to convert their greenhouse units in hydroponics with very little money. Finally, the dynamic entry of pumice on the market as a hydroponics substrate, has further reduced the costs for the conversion.