Dennerle Shrimp King Active Soil is a professional gravel for Shrimp tanks.+ high content of humic and fulvic acids+ with essential minerals and trace elements+ high filter capacity for crystal-clear water+ grain size 1-4 mm+ buffers the pH value at approx. 6.0 - 6.5+ reduces the carbonate hardness to approx. 0 - 2dH+ made in Japan+ ideal water values for soft water loving shrimp (e.g. Red Bees)Application of Dennerle Shrimp King Active SoilPut the unwashed soil into the dry aquarium to a depth of approx. 3-5 cm. Carefully add water. Please note: Osmosis water + BeeSalt = longer effectiveness. Not suitable for animals that require harder or slightly alkaline water.