The oasis FilterStarter Aqua Activ Biokick Fresh is from a very successful combination: , 1. a dry 50 ml culture and 2. a nutrient solution 450ml. , The bottle has a peelable label behind which you will find instructions for use, to comply with the necessary steps for an optimal solution. In the middle of the bottle there is a small container with the dry culture. , More than 1 billion microorganisms / g (ml) are ideal for ponds with fish stock. The microorganisms ensure that the pond filter in the biological equilibrium and the ammonium or ammonia and nitrite or nitrate levels are rapidly degraded. Especially in a pond with fish should ensure a biological balance in the spring, when the filter is activated again, because the water quality could tip and have unpleasant consequences. A replenishment is lt. Manufacturer unnecessary.