Pond algaecides are an effective way to prevent and control algae from building in your pond. Algaecides come in the form of liquids, granules and blocks. Before selecting an algaecide, identify the problem that needs corrected, then choose the product to best fits your needs. Some algaecides are meant to clear green water, some are formulated to prevent green and cloudy water, and some are designed to use on rocks, waterfalls, and other surfaces. Algaecides provide you with an easy way to maintain a clean, healthy, algae-free pond, so that you can spend your time enjoying and not cleaning.