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Rockwool is much more alkaline than other media, so you need to adjust the pH of your nutrients to create an ideal pH for the root zone

By: NaturalFreeChoice.com Soil improvementis necessary to get better crops when you obtain an acidic or alkaline result from a test. You may need to rise or lower the PH level depending on the results obtained from the test. Following are some techniques to adjust the soil to a neutral PH depending on the test results: 1) For both alkaline an acidic: Regularly add mulch, compost, organic fertilizers and other organic material. 2) For acidic soils: The usual way to correct acidity is to use Lime. The safest material is ground up limestone rock (agricultural lime). Also ash from wood fire can be used, crushed seashells ans dolomite.