An ideal additive of trace elements, plant hormones and humic acids. Used for neutral to acid (soft) water, specifically and indigenous fish. Serves to soften the water and lower the pH-value in freshwater tanks. A very practical recommendation is to put the filter material in the HOBBY Net Filter Bag. Ideal additive of trace elements, plant hormones and humic acids. Creates neutral to acid (soft) water, which specifically tropical, subtropical and indigenous fish require. Serves to soften the water and lower the pH-value in freshwater tanks. Do not use in conjunction with filter carbon. Ideal additive of trace elements, plant hormones and humic acids. Creates neutral to acid (soft) water, which specifically tropical, subtropical and indigenous fish require. Serves to soften the water and lower the pH-value in freshwater tanks. Do not use in conjunction with filter carbon.