- Specialized granular filter for water treatment in garden ponds - Removes phosphates, the main nutrient for algae, keeping the water clear and healthy - Easy application: simply fill the included bag, rinse, and place it between the filter sponges - Fast action: reduces high phosphate levels in just 24 hours - Prolonged effectiveness: each dose works for approximately 3 months - Safe for all fish and aquatic plants, with no risk of toxicity or aluminum release - Compatible with most pond filters that accept filter media - Contents: 500 g of PhosEx Pond Filter granules and mesh bag for direct application