Aquatic Arts FilterPlus - Professional Grade Aquarium Filter Bio-Media - 2000g (Enough for 200+ Gallons!) Professional grade Bio-Media for your home aquarium - FilterPlus is the only Bio-Media used by Aquatic Arts in over 150 holding tanks! Provides an instant and significant upgrade to almost any aquarium filter, enabling higher stocking levels and greatly superior Bio-Filtration to Bio-Balls or Ceramic Rings. Extreme surface area provides maximum surface area for growth of beneficial bacteria, enabling higher stocking levels and superior filtration. FilterPlus is also capable of housing anaerobic bacteria, which can greatly reduce the need for water changes. Only 75-100g per 10 gallons is needed for excellent Bio-Filtration. 150-200g per 10 gallons recommended for sensitive animals or high stock levels or bioload. At Aquatic Arts, we use 250g per 10 gallons in even our most heavily stocked tanks. Completely natural! Contains no chemicals or artificial materials. Will not alter PH or hardness, and never needs to be replaced!