Cloudy aquarium water is caused by fine suspended particles such as algae, silt, and bacteria. These particles usually carry a negative charge as does most filter media. The filter media, therefore, repels these particles, and water can remain cloudy. BioMagnet™ imparts a positive electrical charge as a bacterial attractant. This unique formula quickly seeks out and encapsulates suspended particles, enabling the positively charged particles to be drawn to the filter. Particles caught by the filter are broken down by bacteria. The result is crystal clear water, fast!