Zeolite 750ml Nutrient Reduction Media Go to amazon.com Related posts Top 5 recommendation nitrate reducer filter for 2022 FeatureNutrient reducerCoarse grain size (8mm approx.)Supports reducing bacteria DescriptionZeolite is a high purity coarse grain zeolite used to culture reducing bacteria and reduce nutrient levels in marine aquaria, suitable for use in Tunze filters.