Check the listing for details. API Pond-Zyme Sludge Destroyer Pond Cleaner 1 lb.. Condition: New. Listed at 36.88 USD. Keep your pond clean and healthy with the API Pond-Zyme Sludge Destroyer Pond Cleaner. This powerful cleaner is specifically designed to eliminate sludge and improve the overall clarity of your pond water. With its effective and safe formula, you can be sure that your pond will remain free from unwanted contaminants. This product is perfect for pond enthusiasts who want to keep their pond clean and clear without worrying about harmful chemicals. The API Pond-Zyme Sludge Destroyer Pond Cleaner is ideal for use in all types of ponds and water features, and it comes in a convenient 1 lb. size that is easy to apply. Simply add the cleaner to your pond water and let it work its magic, reducing the need for frequent cleaning and ensuring that your fish and plants remain healthy and thriving.