20 Years manufacturing Kleen Pool Algaecide which kills all types of algae in all types of pool water for up to SIX MONTHS!EPA Registered and Trademarked in the USA. Simple pour Kleen Pool in the pool water and swim immediately. Safe and easy to use. Application is 1 gallon for 20,000 gallons of pool water and 1/2 gallon for 10,000 gallons of pool water. Visit our webpage and click on the Understanding Kleen Pool Tab for more info. Email for "Special Pricing" in 55 gallon drums and ship to your location, package in your language or buy in finished goods form as Kleen Pool. Email for more infomation.