Vendeur: viresco2004 (1.801) 100%, Lieu où se trouve: Thirsk, North Yorkshire, Lieu de livraison: Worldwide, Numéro de l'objet: 122240490981 VirescoTM Koi- Microbial Pond Treatment for Blanketweed and Algae VirescoTM Koi was introduced following the success of our product VirescoTM Aqua . Most koi keepers keep very clean ponds and do not have a need for the organic waste digester part of VirescoTM Aqua. Therefore, in April 2000, we introduced VirescoTM Koi. VirescoTM Koi contains 100% of a microbial mixture that removes nitrate and reduces phosphate. These nutrients are the main food source for algae. Once the nitrate drops to zero, the algae dies of starvation. The nitrate level will remain at zero, usually for many weeks and, for some, many months. VirescoTM Koi is chemical free and harmless to plants and wildlife. This 10g pack will treat 6000 gallons (27000 litres) of pond water. It will keep indefinitely in the sealed bag in a cool place. On 08-Jul-09 at 13:49:24 BST, seller added the following information: Several eBay customers have asked how long Viresco Koi takes to work. Many customers see blanketweed dying back within 7-10 days, but it can take up to 4 or 5 weeks. A further dose can speed up the process but is not usually necessary for the product to work.