You need to figure out the gallons in your pond before you buy a pump. Most liners be pacthed instead of replaced to save you los of time, money and frustration. CleenGreen Algaeicde is the fastest way to breakdown the algae. Koi clay will help to clump the dead algae and toxicans toghter making them easier to remove.If you would like you can send me an email and I can forward articles on fixing a leak, and selecting a pump. Have a great day. Sincerely, Gail email richdeer3@yahoo.com