Tetra Pond FilterStart 500ml & 1L With this new product we offer an excellent solution to start a new pond season after the winter. Tetra Pond FilterStart moreover stresses our expertise in bacteria products as it contains bacteria that we grow in our own bacteria farm. Benefits at a glance: ? Activates the pond filter after winter and reduces filter mud. ? Reduces ammonia and nitrite which are toxic to fish. ? Extends the filter cleaning intervals by reducing mud in the filter. ? BEST PERFORMANCE: No major competitor product is able to show a comparable reduction of nitrite!