BACTO REEF BALLS EFFECT: Crystal clear & healthy water, nutrition control and easy reduction of ammonia, nitrite, nitrate and phosphates.Cleans up organic waste and unwanted detritus, raises up skimming, reduces fiter maintenance and eliminates unwanted bacteria and algeas.Easy dosing - with the unique and long lasting depot effect. CONTENT:Millions of live natural marine bacteria in depotballs for marine aquaria.Bacto Reef Balls 100ml contains ca 110 spheres, each ca. 1cm average diameter. DOSING:2 Reef Balls/100 Liters (26,4 US Gal) / every 2 weeks directly in your filter. Avoid that balls soak into pumps.Reef Balls are made from a biodegradable polymer. BACTO REEF BALLS overview:Crystal clear, healthy water,Simplifies nutrient control: reduces nitrogen and phosphates,Reduces unwanted algae growth,Provides cost-effective and efficient means of nutrient control,Supports natural bacterial flora,Eliminates annoying bacterial plaque and detritus build-up,Removes organic waste products,Reinforces the skimming process and minimizes cleaning intervals