Gold Label Hydrocorn XL RHP 16-25mm are the large clay pebbles, these are both RHP and KIWA certified. The bigger size enables more oxygen to enter the root zone of your plants. Gold Label Hydrocorn XL are free from heavy metals and contaminants, they also have an uneven form and are porous that will improve root formation.
Read more about Gold Label Hydrocorn XL RHP 16-25mm here
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