Safely clear "tea colored" pond water. Activated carbon is very effective at removing dissolved organics from pond water, such as stains and discoloration caused by leaves and organic debris. Activated carbon is also great at removing harmful chlorine and chloramines caused by tap water. Typically 4-6 lbs. will treat 1,000 gallons for 2-3 months. Each 9 lb bucket comes with one mesh bag.