Not for use in ornamental ponds when frogs/toads spawning as they will want to lay their eggs in the blanked weed. Not for use in public wildlife ponds. Packaging may vary. This fast-acting, year-round solution delivers excellent results within two weeks and unlike other treatments clears algae and blanket weed in water temperatures as low as 4°C without turning the water milky to help you re-discover the true beauty of your pond! Completely safe for use in ornamental ponds and does not contain harmful metals. Suitable for use with ultraviolet clarifiers and biological pond filters, it is also harmless to fish, frogs & all birds and animals who decide to visit your pond for a refreshing drink!