Fauna Marin Zeo-Light a specially formulated Zeolite for reduction of nutrient concentrations in marine aquaria.This Zeolite provides nitrate- and ammonium-reducing bacteria an ideal environment.By using a composition of different Zeolites, carefully selected for their specific physical and chemical properties, this filter medium will reduce nutrient concentrations fast and effectively.How to use:For preparation wash the zeolite mix under tap water or use reverse-osmosis water and subsequently give the material a 24 h bath in tap water. After this preconditioning the zeolite mix is ready.As a basic dosage apply 1000 g Zeolith mix to 1000 L (260 US gal lqd) aquarium net volume. Make sure you determine your net aquarium volume as exactly as possible.Use the zeolite mix in a zeolite filter unit or in our automatic zeolite filter Zeomatic 2. The automatic cleaning process of Zeomatic 2 makes it easy to maintain a high level of filter function. Without automated purgation the zeolite mix requires cleaning in a 2 day interval. 75% of the zeolite gravel needs tobe replaced after 4 weeks (do not exchange the zeolite and UltraCarb L activated carbon on the same day, but use a14 day shift as a routine in changing both types of filter media).Feel free to use any zeolite mix which is declared to be suitable for marine aquaria. However, we recommend to apply a zeolite from a producer with designated experience in the marine aquarium business, since several zeolite mixes for fresh water or pond filtration are unsuitable for marine aquaria and potentially have a harmful effect.