JBL Clearmec plus is a mixture of baked clay beads and special resins. It helps to reduce all substances in the water which tend to promote the growth of undesirable algae. It absorbs phosphate, nitrite and nitrate without removing important trace elements. The clay beads promote the settlements of beneficial cleansing bacteria. The aquarium water turns crystal clear, creating ideal conditions for fish and plants.Creates crystal-clear aquarium water.Removes the nutrients for algae, preventing excessive algae growth.For 150 to 300 liters freshwater.Absorbs nitrites, nitrates and phosphates for 3 months.Material is ready-packed in filter bags.