Check the listing for details. Evolution Aqua Pure Pond 1000ml - slow release Bacteria. Condition: New. Listed at 29.99 USD. Evolution Aqua Pure Pond 1000ml - slow release BacteriaPURE is Evolution Aqua's Award Winning range of bacterial products for ponds, freshwater aquariums and marine aquariums. PURE products contain incredibly high concentrations of friendly bacteria and enzymes. These are contained within a unique delivery system that when added to your pond or aquarium will help to clean up organic waste and break down ammonia and nitrite. The result is crystal clear and healthy water that sparkles. ▪ Bacteria and enzymes delivered in gel-like balls ▪ Maintains crystal clear and healthy water ▪ Breaks down ammonia and nitrite ▪ Cleans up organic waste ▪ Reduces filter maintenance and cleaning ▪ Suitable for use in all types of ponds▪ Add to filter for best results ▪ Available in 500ml, 1litre and 2 litre