MasterLine I is a concentrated micronutrient combination fertiliser for aquatic plants. It contains strongly chelated iron, manganese, zinc, boron, copper and molybdenum. It is recommended to use MasterLine I together with MasterLine II and MasterLine Carbo. In this way the aquatic plants have all the nutrients necessary for healthy growth. Thanks to the high-quality chelators, the nutrients in MasterLine I retain their properties over a longer period of time, keeping the water crystal clear and offering the possibility of a weekly dosage. This gives the aquarist the freedom to choose between the two dosages.

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