Algimycin Winter Algaecide For a simplified approach to seasonal pool protection, use this non-foaming, non-metallic poly algaecide designed to prevent winter algae growth. Algimycin® Winter Algaecide For a simplified approach to seasonal pool protection, use this non-foaming, non-metallic poly algaecide designed to prevent winter algae growth. Features: Winter algae protection Non-metallic Non-foaming Tips: Clean and vacuum the pool at closing, before adding Algimycin® Winter Algaecide. For hassle-free pool closing, consider GLB"s Pool Closing System, which in addition to Algimycin Winter Algaecide, also includes Oxy-Brite non-chlorine shock and Sequa-Sol, a sequestering agent.