Filter media forms an essential part of any aquarium or pond filtration system. 25mm Bio Balls provide a large surface area for bacteria to develop, helping to break down ammonia and nitrite. Bio Balls also help improve overall water quality by maintaining healthy oxygen and PH levels, and absorbing and breaking down poisonous ions. Long lasting and highly effective, Bio Balls are suitable for use in filtration systems to filter freshwater tropical and saltwater marine fish tanks and ponds. Diameter: 25mm / 2.5cm / 1"
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