Lensli supplies all its substrates with the RHP quality mark. Safe. The entire chain, from the production process to the user is controlled. Clean. RHP-certified substrates are carefully produced. Intensive checks are carried out to ensure that they are phytosanitary, free from harmful organisms and diseases. Quality assurance. Substrates with the RHP quality mark meet the strictest requirements, for example in the field of storage and continuity. Weed arm. Substrates with the RHP quality mark are weed-poor. Research / knowledge center. Innovative research has proven that the substrate meets the various quality requirements. Agreements between grower and substrate supplier are checked based on specifications.