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Pre-Vent a unique product which seeks to succeed where many commercial bacteria cultures fail. Safe for all pond fish, plants and biological filtration systems. Pre-Vent is to be used every 10-14 days to help rebalance your pond as a preventative for the return of stubborn Blanketweed. To be used as a follow-up to the Number 1 selling pond product: Cloverleaf Blanket Answer. For best results use above 10 degrees celsius