Pond concentrate Pond proA powerful probiotic concentrate to help maintain your pond. Pond Pro adds good bacteria to the water. These bacteria immediately remove all of the nutrients that would otherwise be available to feed germs. The pond concentrate is safe for humans and animals. Use the concentrate as follows; Initially: Use 20 ml per 1,000 litres; apply a second treatment after three days; Subsequent treatment: Use 15 ml of Pond Pro per 1,000 litres once per week. It is