Discover the superior solution to blanketweed with Pre-vent Blanketweed Treatment 800g, the Cloverleaf No1 seller. Uniquely formulated to outperform other commercial bacteria cultures, Pre-Vent is safe for all pond fish, plants, and biological filtration systems. Regular use every 10-14 days helps maintain a balanced pond environment and keep stubborn blanketweed at bay. Trust The Pond Men for all your pond maintenance needs and let us help you achieve crystal-clear water effortlessly. Enjoy a healthier, more vibrant pond with Pre-Vent.